Is there an equivalent of WWW::Mechanize for PDFs?

I'm looking for the ability to fill in the text boxes in forms found at http://www.cookcountyassessor.com/ccao/forms.html#Select. The user will save the forms to her computer and fill them out there. Since another application will have the necessary information, it would be nice to just copy that over to the PDF automatically. But unless I haven't thought of the right search key (likely), I'm not seeing a module on CPAN to do it.

Note that I'm not creating a PDF from scratch, I am taking an existing PDF, filling in text boxes, and then printing it. Repeat as necessary. Yes, I know, but some things are required to be on paper.

Thank you.