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.
More information on this great utility can be found @ the authors site here
Lifehacker.com Has some alternative utilities and ideas for cracking pdf’s here
UbuntuGeek has some information about this tool here