JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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If you mean, to upload the form into jotform - while filling it out, then yes, that is possible.
You just need to state that pdf files are accepted. You can see more on how to do that here: Upload Field Allowed File Types
If you meant to show the PDF files instead, you can do that by adding one of our widgets intended for this.
If you are not sure how, you can see here how you can easily add them both to your jotform: How to Add a Widget to your Form
If you have any further questions of course, we are here, so do let us know about them :)