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 embed a PDF with a direct iFrame method, it should not allow any pop-up options. Please see the next guide.
Note, that most of the browser PDF viewers provide a Save/Download option.
If you are referring to something else, please provide us with more information on your inquiry.
Seems like you are using an iFrame code to embed the PDF file in your form, although this could work I would suggest you to use our iFrame widget, it could work as well.
On the Form Builder you only should add the widget to your form:
Then you only need to paste the URL where is stored your PDF file:
Here is a sample form that I made to show you how it works: https://form.jotform.com/60838735487975.
Please, also share us the link to your form so we will take a look and try to figure out why it is showing a pop-up option.