MIB Doc Challenge — PDF Adjudication Ledger

Provenance-first evidence ledger for adversarial PDF adjudication. Air-gapped, deterministic, with dual-OCR and a role-aware trust ladder.

A provenance-first evidence ledger for adversarial PDF adjudication, solving the air-gapped 8090-inc MIB Doc Challenge (no GPU, deterministic, hidden injection payloads on 18.8% of PDFs).

  • Forensic intake: visible vs quarantined span split before anything downstream.
  • Dual-OCR tier: Tesseract + fail-closed RapidOCR reading raw JPEG bytes, never page renders.
  • Role-aware trust ladder: deny-direction evidence from one engine, approve only with corroboration.
  • Headline: 120.00/150 fold-clean OOF, CFA 0; deterministic byte-identical runs (same SHA-256).
  • 2.4–2.5 s/PDF single-core vs 6 s budget.

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