{"version":"2.1.234","anchor":"eval-traces-identify-pdfs-and-zips-by-their-first-bytes","canonical_anchor":"eval-traces-identify-pdfs-and-zips-by-their-first-bytes","heading":"Eval traces identify PDFs and ZIPs by their first bytes","tier":"internal","area":"Eval","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.234\/e\/eval-traces-identify-pdfs-and-zips-by-their-first-bytes","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.234","markdown":"### Eval traces identify PDFs and ZIPs by their first bytes\n\nEval traces now recognise PDFs and ZIPs, including Office documents, by their first bytes.\n\n**What**\n\nA new check reads the leading bytes of a file to spot a PDF signature or a ZIP header, and uses that both to decide the file is binary and to label it, noting that Office documents such as .pptx, .docx and .xlsx are ZIPs.\n\n**Evidence**\n\n`ZIP archive (Office documents such as .pptx\/.docx\/.xlsx are ZIPs)`\n\n- Area: Eval\n- Tier: Under the hood\n- Useful: 1\/5\n- Signal: 1\/5"}