PDF malware analysis — malicious · 4d231967c7d87558

MALICIOUS

PDF

1.3 KB

MD5: ad959bb04f99e31e941eb032fb330a7f SHA-1: c8f9f4e6c964506f2364a08462d1f09a0aa6b211 SHA-256: 4d231967c7d87558ee178842765eea31566429ff076e325024235fa47bed18cf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier and ClamAV detection further support its malicious nature. The embedded JavaScript file, javascript_obj0008_000.js, is likely responsible for executing the malicious payload, though its specific actions are obscured by obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 0.9499

Heuristics 6

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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_obj0008_000.js` `b3421a926dbf6096fcf1247e3ac93109820edc5ba914d2e0cafd2930e12a1638`	pdf-javascript-stream	PDF /JS object 8 at offset 0x2F1	2782 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 92 eval/decoder/string-building token(s).

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