Thanks for the link - interesting reading. It looks like he modified the PDFs from the bank which is pretty sneaky, since most people assume PDFs are inviolable

Thanks for the link - interesting reading. It looks like he modified the PDFs from the bank which is pretty sneaky, since most people assume PDFs are inviolable (this topic has come up on HN before). In my experience, auto-generated PDFs from reporting systems are fairly easy to manipulate (for the record, I have only done so for automated data extraction, not to change the document!).