PDF malware analysis — malicious · e0fa062cfd27774c

MALICIOUS

PDF

17.3 KB Created: 2009-06-30 19:01:07 Authoring application: LHVzKnVTCdAWR (via cMEJlEtlqyP77b)

MD5: cae93dbaf6df9a885d5d8c7c9dcbe63d SHA-1: e8becec0eb0eb1db5ac5c2af9614ab971c94037e SHA-256: e0fa062cfd27774cf4c8600f76b797e0fb5b950d80d2613f20d4d5d233fbc1b8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by a ClamAV signature (Js.Trojan.Obfus-48) and a machine learning classifier. Static analysis revealed embedded JavaScript, including calls to eval() and String.fromCharCode(), indicating obfuscation techniques. The JavaScript is likely designed to exploit vulnerabilities within the PDF reader or download a secondary payload. The presence of JavaScript actions and embedded JS streams strongly suggests an attempt to execute malicious code.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Js.Trojan.Obfus-48 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Js.Trojan.Obfus-48
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.
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_obj0007_000.js` `ad2e23d33111d25011fca0f3bf15419c752dae3f0ac2c62cbf9b4bfc553d117f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x246	16370 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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