Publish Layerfault deep challenge LF-CH-EVAS-0009

CHALLENGE_ORACLE.json

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+{
+  "attack_surface": [
+    "package-evasion"
+  ],
+  "control_type": "positive",
+  "corpus_id": "LF-CH-EVAS-0009",
+  "difficulty": "adversarial",
+  "expected_decision": "BLOCK",
+  "ground_truth": "synthetic-generated",
+  "layerfault_rule_expectations": {
+    "candidate_rules": [
+      "LF-JS-SEMANTIC-PROCESS"
+    ],
+    "expected_rules": [],
+    "must_not_rules": []
+  },
+  "oracle_ids": [
+    "LF-ORACLE-PACKAGE-OBFUSCATED-CAPABILITY"
+  ],
+  "related_cases": [],
+  "repo_name": "evasion-js-string-concat-capability",
+  "safe_fixture": true,
+  "schema": 2,
+  "severity": "high",
+  "techniques": [
+    "javascript-string-concat"
+  ],
+  "transformations": [
+    "string-splitting"
+  ]
+}

FIXTURE_LAYOUT.json

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+{
+  "artifacts": [
+    "config.json",
+    "assets/loader.js"
+  ],
+  "family": "evasion",
+  "note": "All content is synthetic and inert. Do not treat this as a production model.",
+  "repo_name": "evasion-js-string-concat-capability"
+}

LAYERFAULT_CORPUS.json

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+{
+  "candidate_rules": [
+    "LF-JS-SEMANTIC-PROCESS"
+  ],
+  "challenge": {
+    "attack_surface": [
+      "package-evasion"
+    ],
+    "control_type": "positive",
+    "difficulty": "adversarial",
+    "expected_decision": "BLOCK",
+    "oracle_ids": [
+      "LF-ORACLE-PACKAGE-OBFUSCATED-CAPABILITY"
+    ],
+    "related_cases": [],
+    "severity": "high",
+    "techniques": [
+      "javascript-string-concat"
+    ],
+    "transformations": [
+      "string-splitting"
+    ]
+  },
+  "corpus_id": "LF-CH-EVAS-0009",
+  "description": "Dormant JavaScript child-process strings are reconstructed at runtime.",
+  "expected_rules": [],
+  "generator": "challenges.generate_challenge",
+  "ground_truth": "synthetic-generated",
+  "must_not_rules": [],
+  "repo_name": "evasion-js-string-concat-capability",
+  "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
+---
+
+# evasion-js-string-concat-capability
+
+> **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-EVAS-0009`
+
+## Purpose
+
+Dormant JavaScript child-process strings are reconstructed at runtime.
+
+## 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-JS-SEMANTIC-PROCESS`
+
+## 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: **high**
+- Difficulty: **adversarial**
+- Expected admission decision: **BLOCK**
+- Control type: **positive**
+- Attack surface: package-evasion
+- Techniques: javascript-string-concat
+- Transformations: string-splitting
+
+### Ground-truth oracle IDs
+
+- `LF-ORACLE-PACKAGE-OBFUSCATED-CAPABILITY`
+
+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": "18291848b345a1a0a4370f0d7ecc43adfdb700f2caa71baf32f74b35f2b4dc6b",
+    "size": 687
+  },
+  {
+    "path": "FIXTURE_LAYOUT.json",
+    "sha256": "4ecb7cbf0a92cae2eff47782de62a1135ce9b90ed325084370fd14420f77fdd7",
+    "size": 234
+  },
+  {
+    "path": "LAYERFAULT_CORPUS.json",
+    "sha256": "58d5a9b806d2a51aad1b2264e3f50ef3958c76abedefa22ebc51c68cde17038a",
+    "size": 959
+  },
+  {
+    "path": "README.md",
+    "sha256": "b11a14d75c50b6e0f402612bea2c7eb7479356f25a988737b3697e872a12ca90",
+    "size": 2302
+  },
+  {
+    "path": "assets/loader.js",
+    "sha256": "d16a3f290392136a2be81ad8104582ff55a650c3eb77fba76bbafae4a17f3abc",
+    "size": 336
+  },
+  {
+    "path": "config.json",
+    "sha256": "68d4b6c3308015c36332de690b727c02878531e6440ced97fcf1fd1a46d41704",
+    "size": 88
+  }
+]

assets/loader.js

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+// Synthetic dormant capability fixture. Never invoked.
+function dormantFixture() {
+  const moduleName = "child_" + "process";
+  const methodName = "exec" + "FileSync";
+  const cp = require(moduleName);
+  return cp[methodName](process.execPath, ["--version"]);
+}
+const MARKER = "LAYERFAULT_FIXTURE:evasion-js-string-concat-capability";

config.json

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+{
+  "asset_root": "assets",
+  "fixture": true,
+  "model_type": "layerfault_challenge"
+}