This tool allows you to start with a list of page URLs, and then extract any PDF URLs listed on those pages.
I had a need to find all the PDFs on a website I was working on, but not across the whole site – just those on a list of certain pages. So rather than manually do that by viewing the source code on every page and searching for .pdf references, I created this little tool – which might help someone else who finds themselves in the same boat!