pdfgrab is a python script that analyzes pdf files to extract their metadata. You can direct it to analyze a single file, a directory of pdfs, provide it a url, or have it leverage googlesearch to get pdfs at a target site.
You can download it from the following link: https://packetstormsecurity.com/files/download/154715/pdfgrab_0.4.4.tar.bz2
Source: https://packetstormsecurity.com/files/154715/PDFGrab-0.4.4.html