How to scan for fields on a PDF


I have an editable PDF form generated by Salesforce that can vary in length from 7 to x pages depending on number of customers for an account that I need to pull empty fields from.

Is there a way to find empty fields from a PDF document that always has the same layout but may have multiple copies of one section based on the customer information?

For example, there may be a customer with 4 account holders and in the pdf section 1 there’s account information like Name, DOB, City, State etc. but copied 4 times with different inputs for those various fields. What I want to do is extract the data from the PDF and put into a datatable all the missing fields.

I’ve tried using scrape data and the selectors do not work. Any help would be greatly appreciated!