PDF malware analysis — malicious · e73c5db066cf7c46

MALICIOUS

PDF

2.3 KB

MD5: 38f7d6ac0122db6a2ceb503b73fd4ff5 SHA-1: 4906874b55103c931938b4745dbaf6c47d08e9b9 SHA-256: e73c5db066cf7c46afb4dd398fa2526599e2ca4da0738268c5215f3a4e3954fd

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged as malicious by a machine learning classifier with a high confidence score. Static analysis revealed embedded JavaScript, including calls to eval() and String.fromCharCode(), which are commonly used to obfuscate and execute malicious code. The presence of a JavaScript stream and the ML classification strongly suggest the PDF is designed to exploit vulnerabilities or trick the user into running a malicious script, likely to download and execute a further payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `e31748cbf834277927eaef2869e2768b0598d256951c7e76521ab40ac101c70c`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD6	18417 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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