registry / Remote code execution / pob-test-package-in-monorepo
pob-test-package-in-monorepo
test pob
This report shows the evidence for pob-test-package-in-monorepo@5.2.9. 16 of 16 known versions are blocked or flagged. The newest version, 5.2.16, is blocked. See all versions.
AI Security Review
scanned 3mo ago · by lpm-firewall-aiSource inspection confirms a concrete, unconsented preinstall bootstrapper executing an obfuscated payload that evaluates remotely supplied code. This is malicious behavior, not a package-aligned installation need.
Static reason
One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review; source fingerprint signature matched known malicious package; routed for review
Trigger
npm install (preinstall)
Impact
Arbitrary install-time code execution and likely credential/token theft.
Mechanism
bootstrap Bun, execute obfuscated remote-code payload
Attack narrative
The preinstall hook runs setup.mjs. It uses an existing Bun binary or downloads one from GitHub, then executes math_init.js. That large obfuscated payload contains remote fetch plus eval and token/child-process handling, creating an install-time remote-code execution chain unrelated to the package's trivial exported API.
AI rationale
Source inspection confirms a concrete, unconsented preinstall bootstrapper executing an obfuscated payload that evaluates remotely supplied code. This is malicious behavior, not a package-aligned installation need.
Evidence
package.jsonsetup.mjsmath_init.jslib/index.js
Network endpoints1
github.com
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- package.json runs setup.mjs as preinstall.
- setup.mjs downloads Bun from github.com and executes math_init.js.
- math_init.js is a 728KB obfuscated executable payload.
- math_init.js contains remote fetch and eval of returned content.
- Obfuscated payload references child_process and token handling.
Evidence against
- lib/index.js only exports a literal string.
- The Bun download URL itself is a legitimate GitHub release host.
Behavioral surface
ChildProcessEvalFilesystemNetworkShell
HighEntropyStringsMinifiedUrlStrings
Source & flagged code
4 flagged · loading sourcepackage.jsonView file
•scripts.preinstall = node setup.mjs
High
Install Time Lifecycle Scripts
Package defines install-time lifecycle scripts.
package.jsonView on unpkgmath_init.jsView file
1// @bun @bun-cjs
L2: var MmgoCP,etDiOOB,JqTtnbZ,bc3Kak,ZQmUTyQ,TTUgga,MDX6yrw,h8wMJNB,CabwE2L,x5ErqV;function WV8StW(MmgoCP,etDiOOB,JqTtnbZ){for(JqTtnbZ=0x0;JqTtnbZ<etDiOOB;JqTtnbZ++)MmgoCP.push(MmgoCP...
Low
Eval
Package source references a known benign dynamic code generation pattern.
math_init.jsView on unpkg · L1setup.mjsView file
•matchType = normalized_sha256
matchedPackage = @ornikar/graphql-config@1.1.1
matchedPath = setup.mjs
matchedIdentity = npm:QG9ybmlrYXIvZ3JhcGhxbC1jb25maWc:1.1.1
similarity = 1.000
summary = normalized source hash matched finalized malicious source
Findings
3 High2 Medium5 Low
HighInstall Time Lifecycle Scriptspackage.json
HighKnown Malware Source Similaritysetup.mjs
HighKnown Malware Source Fingerprint Signaturesetup.mjs
MediumNetwork
MediumStructural Risk Force Deep Review
LowScripts Present
LowEvalmath_init.js
LowFilesystem
LowHigh Entropy Strings
LowUrl Strings
Affected versions and remediation
This report applies to pob-test-package-in-monorepo@5.2.9.
The versions list below shows the verdict for each recorded version.
- Avoid installing pob-test-package-in-monorepo@5.2.9. Remove it from direct dependencies and check your lockfile for transitive copies.
- Choose an independently verified alternative or release. This report does not establish that other versions are safe.
- If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.
Evidence last updated: .
Source advisory published: .
Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.