tutorial - PDFCrack - A Password Recovery / Crack Tool for PDF-files on Linux

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).

Features:
  • Supports the standard security handler (revision 2, 3 and 4) 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
  • Optimised search for owner-password when user-password is known
Installation:
OpenSuSe user can install PDFCrack using "1-click" installer - here
Install pdfcrack on Ubuntu by typing: sudo aptitude install pdfcrack

Using PDFCrack:
Run a quick benchmark by entering the following at the command line:
pdfcrack -b
Use pdfcrack to crack an encrypted pdf-file by typing:
pdfcrack crack.pdf






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source:http://linuxpoison.blogspot.com/2010/02/135781757111313.html