There is no reason you can't attach a PDF to an email without complicating it by getting Facebook involved.
If you don't have the PDF, You first have to create it using either one of the online PDF creator services or downloading and installing the software to your machine. Search for "Create PDF"
Once you've created the file, you load the recipient's email in the create email box, click on Insert/Attachment and attach it to a email and send it.
Getting help with things like this is always easier if you explain how you're doing it and what happens when you try.
Answered Aug 02, 2012
Edited Aug 02, 2012