Unlike tools that try to remove passwords (which is impossible for well-encrypted files), pdfcrack.exe attempts to the password through brute-force or dictionary attacks. It does not exploit a software vulnerability; rather, it exploits weak human password choices.
Unlike bulky software with complex interfaces, PDFCrack is a streamlined utility that focuses on one thing: cracking PDF passwords. It supports both (required to open the file) and owner passwords (which restrict printing, copying, or editing). Key Features pdfcrack.exe