What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Yes that is possible, you can use the "iFrame Embed" widget for that. If the height you set is shorter than length of the PDF, then it will automatically display a scroll bar.
You can also use the "Text" field, it allows you to add HTML codes like an <iframe> element on it. Here's a guide you can follow: https://www.jotform.com/help/153-How-to-Display-a-PDF-Document-On-Your-Form.
I hope those will help.