Are you trying to for a specific file, or are you just looking for a general PDF management tool ?

A search engine returned a single, promising link:

Arthur watched in horror as his webcam’s little green light flickered on. On the screen, the software hadn't just removed the password from his PDF—it had started uploading his entire 'Documents' folder to an unknown server.

Suddenly, a window popped up. It wasn't the PDF unlocker. It was a simple text file: “Your vault is open. But so is your door.”

How to remove a PDF password in 3 easy steps | Adobe Acrobat

Here is a short story about the "digital ghost" that often lives behind such links. The Key to the Vault

: The industry standard for unlocking PDFs when you have the owner's permission.