https://www.sysgeeker.com/blog/how-to-crack-a-pdf-password.html
First, open a web browser and navigate to an online PDF password cracker such as PDF Unlocker (link in Resources). Then, click on the " Browse " button and select the PDF file that you wish to crack the password for. Finally, click on the " Unlock PDF " button and the PDF password will be cracked.

https://zsecurity.org/cracking-password-protected-pdf-files-kalyani-rajalingham/
Step 0: import the required modules. Step 1: Ask the user where the pdf is located and assign it a name. Step 2: Ask the user where the dictionary file is located and assign it a name. Step 3: Then open up the dictionary file in read mode and first of all strip newlines and the likes.

https://hackeracademy.org/how-to-hack-a-pdf-file-password-on-windows/
Step 1: Download a good pdf cracking software. After many tests, iSeePassword Dr.PDF can be regarded as one of the best PDF password recovery tools, which can be used to quickly crack PDF open passwords and remove PDF permission passwords without touching original data. Let's see how Dr.PDF works. Step 2: Install The pdf password recovery tool.

https://blog.pentesteracademy.com/cracking-password-of-a-protected-pdf-file-using-hashcat-and-john-the-ripper-1b50074eeabd
An encrypted PDF (1.4-1.6) file is provided. The password was chosen either from a dictionary or using the password policy. The pdf file is present in the user's home directory and the dictionary file "1000000-password-seclists.txt" is present in the wordlists directory. Objective: Recover the password, decrypt the PDF, and retrieve the

https://ourcodeworld.com/articles/read/939/how-to-crack-a-pdf-password-with-brute-force-using-john-the-ripper-in-kali-linux
3. Brute Force with John. Now that we have the .hash file of the PDF with password that we want to unlock, we just need to pass the file as argument to the CLI tool of JohnTheRipper (in the run directory): john protected_pdf.hash. This will use UTF-8 as the default input encoding and will start to guess the password of the PDF file using the

https://dev.to/pahujanayan/cracking-the-code-unlocking-password-protected-pdfs-with-masked-brute-force-2ekh
To work with a password-protected PDF file in John the Ripper, you first need to create a hash file using the 'pdf2john.pl' tool, which is available in the 'run' directory after compiling John the Ripper from its source code. This Perl script tool allows you to extract the hash (metadata information) from the PDF file and save it to a new file

https://www.reddit.com/r/sysadmin/comments/w4g8kc/cracking_passwords_on_pdf_files/
I've been trying this "John" tool but it just seems to run endlessly. I created an Adobe PDF 6.0 file with a four character password and 12 hours later its still trying to crack the password. Archived post. New comments cannot be posted and votes cannot be cast. Bruce force is no guarantee, especially if you don't have a high performance computer.

https://thehackernews.com/2019/10/pdf-password-encryption-hacking.html
The researchers tested their PDFex attacks against 27 widely-used PDF viewers, both for desktop and browser-based, and found all of them vulnerable to at least one of the two attacks, though the majority were found vulnerable to both attacks. The affected PDF viewers include popular software for Windows, macOS and Linux desktop operating

https://github.com/germabyte/pdf-excel-password-cracker
Support for Multiple File Types: Works with both PDF and Excel files.; Numeric Brute Force: Attempts passwords using numeric combinations up to a specified number of digits.; Dictionary Attack: Utilizes provided text files containing potential passwords.; File Dialog Interface: Enables easy file selection for both the target file and the dictionary files.

https://www.makeuseof.com/pdf-password-remover-tools/
1. Wondershare PDF Password Remover. Wondershare is simple to use and can unencrypt PDF documents within seconds. The tool offers users a user-friendly interface. Its professional PDF password cracker software is compatible with all versions of Windows and Mac.

https://thepycodes.com/how-to-crack-pdf-files-in-python/
Crack PDF File Functions. Now, let's define our functions - the heartbeat of our code: browse_pdf Function. This function, browse_pdf, initiates by opening a file dialog window with the title " Choose PDF ", where only files of the PDF format (indicated by " *.pdf ") are displayed for selection, thanks to the filetypes parameter. If the user picks a file, meaning they've chosen

https://smallpdf.com/unlock-pdf
Unlock PDF. Choose File. or drop PDF here. Remove passwords from PDFs online easily for free. No size limits and no ad watermarks. Unlock PDFs without sign-up or installation. Remove the password from your PDF in seconds. TLS encryption for secure document processing.

https://www.comparitech.com/blog/information-security/hackers-crack-passwords/
Malware. Another option for stealing passwords is to infect targets with malware. Many strains of malware can log keys, access the clipboard and sniff network packets, all of which may be able to send passwords to a server controlled by an attacker. Once more, this can be a lot easier than brute forcing a password.

https://www.freecodecamp.org/news/how-to-use-hydra-pentesting-tutorial/
Let's start with a simple attack. If we have the username and password that we expect a system to have, we can use Hydra to test it. Here is the syntax: $ hydra -l <username> -p <password> <server> <service>. Let's assume we have a user named "molly" with a password of "butterfly" hosted at 10.10.137.76.

https://github.com/MichaelSasser/pdfcrack-ng
pdfcrack-ng (pdfcrack next generation) pdfcrack-ng is a simple tool written in C to recover forgotten passwords from PDFs. It should be able to handle all PDFs that uses the standard security handler but the PDF-parsing routines are a bit hacky. You might stumble across some PDFs where the parser needs to be fixed to handle them.

https://www.reddit.com/r/hacking/comments/xn4kd7/pdf_password_hack/
To crack a PDF document you don't need the whole document, just the hash. The hashes are extracted using pdf2john.py. Look for a cloud cracking service that accepts these PDF hashes, there are several. That way the only thing exposed to a third party will be the password and only if they manage to crack it. 2.

https://www.kali.org/tools/pdfcrack/
PDFCrack is a simple tool for recovering passwords from pdf-documents. It should be able to handle all pdfs that uses the standard security handler but the pdf-parsing routines are a bit of a quick hack so you might stumble across some pdfs where the parser needs to be fixed to handle. The main PDFCrack features are:

https://github.com/IvanHanonoCozzetti/PDF-Cracker
In order to unlock a file change the yourpasswordlist.txt to the name of your password list and locked.pdf to the name of the PDF file that you are trying to crack. Disclaimer: All the scripts and instructions in this repository are for educational and informational purposes only, such as Ethical Hacking, Security, Penetration Testing and

https://mobygeek.com/features/a-flaw-of-pdf-allows-hackers-to-access-password-protected-files-9204
According to the researchers, even without the password, the hacker could still manipulate some parts of the encrypted PDF document. So the hacker would modify the encrypted PDF document. After that, when the document gets the correct password, it will send a copy of the protected content to a server (of the hacker) via JavaScript code, URL, or

https://ipv64.net/wiki/pdfcrack-a-quick-guide-to-unlocking-password-protected-pdfs
To set a maximum password length, use -M. To skip passwords below a certain length, use -n. Example: Let's say we have a file named "encrypted_file.pdf" with an unknown password. To crack it using PDFCrack with a minimum password length of 6 characters and using only numeric characters, enter the following command:

https://www.easepdf.com/unlock-pdf/
Simply by navigating to the online tool and uploading the PDF for unlocking its password, the rest of the work will be completed for you by EasePDF. Except for this, the encryption and auto-deletion techniques employed by EasePDF can strongly protect the security of your file data. So you won't confront with any privacy disclosure while using

https://smallpdf.com/blog/forgot-pdf-password
Download, install and open the Desktop app. Select "Unlock" from the left-hand panel. Drag a PDF into the window. Click "Unlock," and you're all set! Unlock PDF offline. Get Offline App. As you can see, multiple file processing is also enabled for the desktop app, so you can unlock or encrypt as many PDFs as you'd like in one go.

https://techcommunity.microsoft.com/t5/windows-11/how-to-crack-pdf-password-offline-on-windows-11-laptop/td-p/4014298
Contacting the Creator: If you received the PDF from someone else, the simplest and most legal method is to contact the creator of the PDF and request the password. PDF Password Recovery Tools: There are several third-party tools available that can assist in recovering or removing passwords from PDFs, such as Dr.PDF, which is one of the most