title_body: Identify if a PDF document is digital native
upvoted_answer: PDF documents embed all its fonts within the document. You can get these embedded fonts information programmatically with most PDF libraries.
  
  If there are no embedded fonts then the PDF at hand is a scanned one.
  If there are only one or two fonts, then the document is OCRized.
  If there are three or more fonts, then the document is a digital native.
  
  Potentially, there can be digital native PDF with one or two fonts only but luckily for me this is an acceptable error rate.