How to identify modified PDF

[rishikesh35680032c46n]

Hi,

In a bank many cases we have we have received modified bank statement (PDF or other income documents(PDF). So how we can idenfity given PDF document is original or modify. 

[try67 · Accepted solution]

The only way to verify it is if the original file was digitally signed. In that case you can validate it using the bank's public key. Anything else can not be trusted.

[JR Boulay]

Yes, try67 is right.
Otherwise you can compare the creation date and the modification date, but that's only a hint, not a certainty.