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Prompt Injection Through Documents: How to Harden an LLM Extraction Pipeline

A document is not a passive object once a language model reads it. Anything printed, hidden or embedded in a PDF becomes part of the model's context, and text in context can read as an instruction.

  • Attackers can inject hostile text in documents to manipulate LLMs
  • Document payloads hide in invisible text, white glyphs, and metadata
  • Robust architecture separates document reading from decision-making

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