Can you figure out what tools produced a PDF?

[Nancy Allison <maker -at- verizon -dot- net>]

We are looking at some great sample documentation in PDF format, and I've been asked to figure out what tools produced the PDF.
 
I think this is not possible, but I'm very willing to be wrong. Is there a way to identify whether Word, Frame or some other tool produced a PDF?
 
Thanks.
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