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Hidden text in PDFs reaches your LLM. Here's how to flag it in 40 lines of Python

This story is from 2026-10-15. It is preserved in the archive; the latest stories are on the live feed.

Part 1 of a series on how files attack AI models and agents. Follow me here on dev.to to get the next part when it comes out. The material for this series came out of building file intake for AI agents at FoxNose. Every technique here is one we had to reproduce, measure and design for in our own pi…

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  1. 2026-10-15 07:23 · DEV Community — AI
    Hidden text in PDFs reaches your LLM. Here's how to flag it in 40 lines of Python

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