Publish Layerfault deep challenge LF-CH-MFMT-0012

CHALLENGE_ORACLE.json

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+{
+  "attack_surface": [
+    "media-format"
+  ],
+  "control_type": "positive",
+  "corpus_id": "LF-CH-MFMT-0012",
+  "difficulty": "hard",
+  "expected_decision": "WARN",
+  "ground_truth": "synthetic-generated",
+  "layerfault_rule_expectations": {
+    "candidate_rules": [],
+    "expected_rules": [],
+    "must_not_rules": []
+  },
+  "oracle_ids": [
+    "LF-ORACLE-MEDIA-FILENAME-EVASION"
+  ],
+  "related_cases": [],
+  "repo_name": "media-case-mismatch-extension",
+  "safe_fixture": true,
+  "schema": 2,
+  "severity": "low",
+  "techniques": [
+    "case-evasion"
+  ],
+  "transformations": [
+    "case-variation"
+  ]
+}

FIXTURE_LAYOUT.json

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+{
+  "artifacts": [
+    "preview.PnG.bin"
+  ],
+  "family": "media",
+  "note": "All content is synthetic and inert. Do not treat this as a production model.",
+  "repo_name": "media-case-mismatch-extension"
+}

LAYERFAULT_CORPUS.json

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+{
+  "candidate_rules": [],
+  "challenge": {
+    "attack_surface": [
+      "media-format"
+    ],
+    "control_type": "positive",
+    "difficulty": "hard",
+    "expected_decision": "WARN",
+    "oracle_ids": [
+      "LF-ORACLE-MEDIA-FILENAME-EVASION"
+    ],
+    "related_cases": [],
+    "severity": "low",
+    "techniques": [
+      "case-evasion"
+    ],
+    "transformations": [
+      "case-variation"
+    ]
+  },
+  "corpus_id": "LF-CH-MFMT-0012",
+  "description": "Valid PNG with mixed-case misleading extension.",
+  "expected_rules": [],
+  "generator": "challenges.generate_challenge",
+  "ground_truth": "synthetic-generated",
+  "must_not_rules": [],
+  "repo_name": "media-case-mismatch-extension",
+  "repo_type": "model",
+  "safe_fixture": true,
+  "safety": "inert/canary-only",
+  "schema": 1,
+  "validation": {
+    "kind": "verify-package",
+    "target": "."
+  }
+}

README.md

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+---
+license: apache-2.0
+tags:
+- layerfault
+- security-research
+- model-security
+- synthetic
+- adversarial-testing
+extra_gated_prompt: >-
+  This repository is a synthetic security-test artifact from the Layerfault
+  corpus. It intentionally contains adversarial characteristics (e.g.
+  suspicious pickle opcodes, executable-format smuggling, prompt-injection
+  strings) designed to exercise security scanner detection rules. It is
+  **not** a usable ML model and must never be loaded or executed outside an
+  isolated scanner-testing environment. By accepting, you confirm you
+  understand this repository is a test fixture, not production model
+  weights.
+extra_gated_button_content: I understand this is a security test fixture and accept the risk
+gated: auto
+---
+
+# media-case-mismatch-extension
+
+> **SECURITY TEST ARTIFACT: DO NOT USE AS A PRODUCTION MODEL**
+
+This repository is part of the Layerfault synthetic security corpus.
+It is deliberately constructed to contain security-relevant characteristics for scanner testing.
+
+**Corpus ID:** `LF-CH-MFMT-0012`
+
+## Purpose
+
+Valid PNG with mixed-case misleading extension.
+
+## Direct expected Layerfault rules
+
+- None; this repository is a control/comparison input.
+
+## Candidate rules
+
+These are deliberately plausible targets that remain marked as candidates until the exact
+Layerfault build used for certification confirms them.
+
+- None
+
+## Negative-control rules
+
+These should remain silent for this corpus item.
+
+- None
+
+## Safety
+
+The corpus uses fake secrets, loopback/`.invalid` network destinations, harmless marker output,
+and synthetic model behavior only. It is intended for static scanning and isolated security testing.
+
+## Challenge classification
+
+- Severity: **low**
+- Difficulty: **hard**
+- Expected admission decision: **WARN**
+- Control type: **positive**
+- Attack surface: media-format
+- Techniques: case-evasion
+- Transformations: case-variation
+
+### Ground-truth oracle IDs
+
+- `LF-ORACLE-MEDIA-FILENAME-EVASION`
+
+These oracle IDs describe synthetic ground truth. They do not claim that a
+matching Layerfault detector already exists. A challenge may intentionally expose
+a scanner blind spot and remain unmapped until the detector is implemented.

SHA256SUMS.json

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+[
+  {
+    "path": "CHALLENGE_ORACLE.json",
+    "sha256": "3aa9fafc579004acb2df34f25106823bf57bba8d859870972fbb0ef095194b54",
+    "size": 612
+  },
+  {
+    "path": "FIXTURE_LAYOUT.json",
+    "sha256": "86a96a5607436169a75caadef237b0246a2acf848619ec7902ab579ea80ffa2e",
+    "size": 206
+  },
+  {
+    "path": "LAYERFAULT_CORPUS.json",
+    "sha256": "5ee877a0eb70586b0e785fbfd29769e24a82c51f1b925cffeca13bae2bbbd7eb",
+    "size": 865
+  },
+  {
+    "path": "README.md",
+    "sha256": "615c342ebe833bbd5b88bca2d863d2bfa20cbbf0680e877b3deb53180e42f314",
+    "size": 2220
+  },
+  {
+    "path": "preview.PnG.bin",
+    "sha256": "97fbbdd2fe7e0d51dc1993e45a8dc792d25bdb376854b73fd4d70859e1f48c3c",
+    "size": 924
+  }
+]

preview.PnG.bin

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:97fbbdd2fe7e0d51dc1993e45a8dc792d25bdb376854b73fd4d70859e1f48c3c
+size 924