Unverified50% confidenceFactExact time
Hidden prompt injection instructions can be embedded in documents via white-colored text, extremely small font sizes, or metadata.
1
Sources
50%
Confidence
Long-term
Relevance
9/12/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedMethods for hiding text in PDF and Word documents include white-colored fonts, extremely small font sizes, invisible layers, Unicode zero-width characters, metadata field embedding, and using PDF's JavaScript to dynamically generate text.78% similarUnverifiedResearchers have found that hidden character techniques can be used to launch prompt injection attacks against large language models, embedding hidden instructions within normal text that the model will parse and execute.70% similarUnverified攻击者可利用视觉不可见的Unicode特殊字符或白色文字置于白色背景使人工审阅防御失效68% similarUnverifiedWriting specifications as structured documents is essentially replacing uncertain memory recall with deterministic text injection.67% similar
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