Not sure I'm giving good advice here, but if it's OCR, even if for excel generated pdfs you'd probably be looking at third-party software.
That or you call APIs at Google Tesseract, Amazon Textract, or Microsoft OCR
You can play around with UI Path, there is a pre-built um very simple OAuth1.0 NetSuite REST WEB SERVICES API pre-built, and then on your local machine the robot can do the above OCR. Community edition is free, I landed myself a 2 year trial last year, seems aight 👍