Crack Pdf Files with Ubuntu Linux!

Don’t you hate when you run into a locked down pdf on the web?

I search google all the time for title filetype:pdf and some are locked, this is the solution!

PDFCrack is a GNU/Linux (other POSIX-compatible systems should work too) tool for recovering passwords and content from PDF-files. It is small, command line driven without external dependencies. The application is Open Source (GPL).

  • Supports the standard security handler (revision 2 and 3) on all known PDF-versions
  • Supports cracking both owner and userpasswords
  • Both wordlists and bruteforcing the password is supported
  • Simple permutations (currently only trying first character as Upper Case)
  • Save/Load a running job
  • Simple benchmarking
  • Optimized search for owner-password when user-password is known

1. Install pdfcrack in Ubuntu

sudo  aptitude install pdfcrack

2. pdfcrack Syntax

pdfcrack -f filename [options]

3. pdfcrack Options

-b, - -bench - Perform benchmark and exit.
-c, -  -charset=STRING - Use the characters in STRING as charset.
-m, -  -maxpw=INTEGER - Stop when reaching INTEGER as password length.
-n, -  -minpw=INTEGER - Skip trying passwords shorter than INTEGER.
-l, -  -loadState=FILE - Continue from the state saved in FILENAME.
-o, -  -owner - Work with the ownerpassword.
-p, –password=STRING - Uses  STRING as userpassword to speed up breaking ownerpassword (implies -o).
-q,  - -quiet - Run quietly.
-s, - -permutate - Try permutating the  passwords (currently only supports switching
first character to  uppercase).
-u, - -user - Work with the userpassword (default).
-v,  - -version - Print version and exit.
-w, - -wordlist=FILE - Use FILE  as source of passwords to try.

pdfcrack Example

pdfcrack mylocked.pdf

More information on this great utility can be found @ the authors site here Has some alternative utilities and ideas for cracking pdf’s here

UbuntuGeek has some information about this tool here

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