Each product allows a Products URL (a field which you could use to point to the *.pdf file).
You would probably want to create a directory (say, named pdf) inside your catalog directory to house the documents you upload, then path them properly in the Products URL. A link is then shown in the product info.
If this won't work for you (perhaps you're already using the Product URL for something else) just add to your product description
Code:
<a href="pdf/document.pdf">PDF Document</a>
to point to the *.pdf.
Hope this helps!
Jeff
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