Publish Layerfault deep challenge LF-CH-MCONT-0009

CHALLENGE_ORACLE.json

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+{
+  "attack_surface": [
+    "media-container",
+    "package-evasion"
+  ],
+  "control_type": "compound",
+  "corpus_id": "LF-CH-MCONT-0009",
+  "difficulty": "compound",
+  "expected_decision": "BLOCK",
+  "ground_truth": "synthetic-generated",
+  "layerfault_rule_expectations": {
+    "candidate_rules": [
+      "LF-FORMAT-APPENDED-ARCHIVE",
+      "LF-CODE-SUBPROCESS"
+    ],
+    "expected_rules": [],
+    "must_not_rules": []
+  },
+  "oracle_ids": [
+    "LF-ORACLE-MEDIA-APPENDED-CONTAINER"
+  ],
+  "related_cases": [],
+  "repo_name": "media-jpeg-zip-python-source",
+  "safe_fixture": true,
+  "schema": 2,
+  "severity": "critical",
+  "techniques": [
+    "appended-archive",
+    "nested-source"
+  ],
+  "transformations": [
+    "nesting",
+    "cross-format"
+  ]
+}

FIXTURE_LAYOUT.json

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+{
+  "artifacts": [
+    "preview.jpg"
+  ],
+  "family": "media",
+  "note": "All content is synthetic and inert. Do not treat this as a production model.",
+  "repo_name": "media-jpeg-zip-python-source"
+}

LAYERFAULT_CORPUS.json

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+{
+  "candidate_rules": [
+    "LF-FORMAT-APPENDED-ARCHIVE",
+    "LF-CODE-SUBPROCESS"
+  ],
+  "challenge": {
+    "attack_surface": [
+      "media-container",
+      "package-evasion"
+    ],
+    "control_type": "compound",
+    "difficulty": "compound",
+    "expected_decision": "BLOCK",
+    "oracle_ids": [
+      "LF-ORACLE-MEDIA-APPENDED-CONTAINER"
+    ],
+    "related_cases": [],
+    "severity": "critical",
+    "techniques": [
+      "appended-archive",
+      "nested-source"
+    ],
+    "transformations": [
+      "nesting",
+      "cross-format"
+    ]
+  },
+  "corpus_id": "LF-CH-MCONT-0009",
+  "description": "JPEG appends a ZIP with dormant Python capability source.",
+  "expected_rules": [],
+  "generator": "challenges.generate_challenge",
+  "ground_truth": "synthetic-generated",
+  "must_not_rules": [],
+  "repo_name": "media-jpeg-zip-python-source",
+  "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-jpeg-zip-python-source
+
+> **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-MCONT-0009`
+
+## Purpose
+
+JPEG appends a ZIP with dormant Python capability source.
+
+## 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`
+- `LF-CODE-SUBPROCESS`
+
+## 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: **critical**
+- Difficulty: **compound**
+- Expected admission decision: **BLOCK**
+- Control type: **compound**
+- Attack surface: media-container, package-evasion
+- Techniques: appended-archive, nested-source
+- Transformations: nesting, cross-format
+
+### Ground-truth oracle IDs
+
+- `LF-ORACLE-MEDIA-APPENDED-CONTAINER`
+
+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": "13ac8e2f70a90ee7354d1dbb28ec2e368119fbc0393744f305e79cc19a464d0c",
+    "size": 756
+  },
+  {
+    "path": "FIXTURE_LAYOUT.json",
+    "sha256": "26f2ea0e2e52ea588291f201111bd8bd9d5702a752f58e1b3209d84a529c194c",
+    "size": 201
+  },
+  {
+    "path": "LAYERFAULT_CORPUS.json",
+    "sha256": "12ee3eaf9145ac8f334288b33920e0ee15b215bed37e3da7cd780a5e2f8f3f9b",
+    "size": 1019
+  },
+  {
+    "path": "README.md",
+    "sha256": "14c14039198647b566726ab0eed335759660d701e5fa272a28a6b0fb8cff8b8a",
+    "size": 2335
+  },
+  {
+    "path": "preview.jpg",
+    "sha256": "364a12b2c334e4420de23f98cde5a0086f739b98559508eb4052b5c60f478439",
+    "size": 6556
+  }
+]