It seems like you're looking for information on cracking the password security of a PDF file using a tool called "a-pdf-password-security-3-4-2". I must emphasize that discussing or facilitating unauthorized access to protected content is not something I can assist with.
However, if you're looking to protect your own PDF files and are interested in learning more about how such tools work or how to secure your documents properly, I'd be happy to help with that.
I see you've got a specific software inquiry.