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  "text": "Hidden text inside PDFs can secretly change how LLMs write peer reviews, making the review scores artificially higher or lower\n\nIn tests, some models gave 100% accept with a positive hidden prompt, and 0% with a negative one.\n\nThe setup imitates a rushed reviewer, using 1000 ICLR 2024 papers and copy paste style LLM reviews. \n\nEach PDF is turned into Markdown, so white on white or tiny font text becomes part of what the model reads.\n\nThe models fill a fixed review form with set score choices, and the prompt is either neutral, push high, or push low.\n\nA positive injection moves scores into accept bins, a negative one pushes them down, and even neutral prompts accept far more than the human baseline of 43%.\n\nModels that seemed resistant often ignored the rules and output illegal scores like 4, so their text was unusable for copy paste.\n\nThis happens because conversion keeps invisible text in the input stream, and a partial fix is to parse the PDF as images first.\n\n----\n\nPaper – arxiv. org/abs/2509.10248v2\n\nPaper Title: \"Prompt Injection Attacks on LLM Generated Reviews of Scientific Publications\"",
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