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It is not really clear what exactly it was you wanted to do. Please provide more details so that we can provide you the appropriate suggestion as well.
For now, I can only assume 2 possible option.
#1 You want to display a PDF document on the form itself. You can check this user guide on how to
#2 You want to attach a PDF document in form submission email? You can achieve it by following this user guide: How-to-Attach-a-File-to-Autoresponder-Emails
Hope this help.Let us know if you need further assistance.