September 6, 2021

PDF file changes when emailed

Let me start by saying I’m computer literate.

I received an email (Office 365 downloaded to my local Outlook client) with a PDF attachment. An invoice with banking details for payment at the bottom.

I forwarded this email the finance department (ISP Mail service downloaded to a local Outlook client) and when the email arrives it has a different account number in the pdf.

Anyone know of any malicious software able to scan and change data in a PDF?

Or a man in the middle attack?

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