Publish Layerfault deep challenge LF-CH-MMOD-0007

CHALLENGE_ORACLE.json

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+{
+  "attack_surface": [
+    "multimodal-package"
+  ],
+  "control_type": "positive",
+  "corpus_id": "LF-CH-MMOD-0007",
+  "difficulty": "intermediate",
+  "expected_decision": "WARN",
+  "ground_truth": "synthetic-generated",
+  "layerfault_rule_expectations": {
+    "candidate_rules": [
+      "LF-FORMAT-APPENDED-ARCHIVE"
+    ],
+    "expected_rules": [],
+    "must_not_rules": []
+  },
+  "oracle_ids": [
+    "LF-ORACLE-MMOD-0007"
+  ],
+  "related_cases": [],
+  "repo_name": "multimodal-video-thumbnail-polyglot",
+  "safe_fixture": true,
+  "schema": 2,
+  "severity": "medium",
+  "techniques": [
+    "video",
+    "thumbnail",
+    "polyglot"
+  ],
+  "transformations": []
+}

FIXTURE_LAYOUT.json

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+{
+  "artifacts": [
+    "processor_config.json",
+    "assets/preview.png"
+  ],
+  "family": "multimodal",
+  "note": "All content is synthetic and inert. Do not treat this as a production model.",
+  "repo_name": "multimodal-video-thumbnail-polyglot"
+}

LAYERFAULT_CORPUS.json

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+{
+  "candidate_rules": [
+    "LF-FORMAT-APPENDED-ARCHIVE"
+  ],
+  "challenge": {
+    "attack_surface": [
+      "multimodal-package"
+    ],
+    "control_type": "positive",
+    "difficulty": "intermediate",
+    "expected_decision": "WARN",
+    "oracle_ids": [
+      "LF-ORACLE-MMOD-0007"
+    ],
+    "related_cases": [],
+    "severity": "medium",
+    "techniques": [
+      "video",
+      "thumbnail",
+      "polyglot"
+    ],
+    "transformations": []
+  },
+  "corpus_id": "LF-CH-MMOD-0007",
+  "description": "Multimodal video thumbnail polyglot.",
+  "expected_rules": [],
+  "generator": "challenges.generate_challenge",
+  "ground_truth": "synthetic-generated",
+  "must_not_rules": [],
+  "repo_name": "multimodal-video-thumbnail-polyglot",
+  "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
+---
+
+# multimodal-video-thumbnail-polyglot
+
+> **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-MMOD-0007`
+
+## Purpose
+
+Multimodal video thumbnail polyglot.
+
+## 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.
+
+- `LF-FORMAT-APPENDED-ARCHIVE`
+
+## 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: **medium**
+- Difficulty: **intermediate**
+- Expected admission decision: **WARN**
+- Control type: **positive**
+- Attack surface: multimodal-package
+- Techniques: video, thumbnail, polyglot
+- Transformations: none
+
+### Ground-truth oracle IDs
+
+- `LF-ORACLE-MMOD-0007`
+
+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": "44e5d507a04ae3a1535a9593628f385a08913cb94a410f1485e85835cc6907cc",
+    "size": 664
+  },
+  {
+    "path": "FIXTURE_LAYOUT.json",
+    "sha256": "73c0457957b46dcf6f713e06f1b7169a49ce32f84ffda189380432d5f8e4f40d",
+    "size": 249
+  },
+  {
+    "path": "LAYERFAULT_CORPUS.json",
+    "sha256": "7c5c106c275733a9c7a78b25fd233beb515372962defb475219750c6cc03b608",
+    "size": 902
+  },
+  {
+    "path": "README.md",
+    "sha256": "324334d1bfac3c931e19319822110498d360ceb9643ae9843d3b126e8f0d085c",
+    "size": 2247
+  },
+  {
+    "path": "assets/preview.png",
+    "sha256": "6e3e67695bffcfa352aa4a8f8c34b60e21120f171431b2da0c35766165267b9d",
+    "size": 1065
+  },
+  {
+    "path": "processor_config.json",
+    "sha256": "4eb8f78c40c7e5b8f04a30ba6b72c8cea7fe0189124ad11db49061f1a214d03c",
+    "size": 76
+  }
+]

processor_config.json

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+{
+  "preview": "assets/preview.png",
+  "processor_class": "AutoProcessor"
+}