PDF malware analysis — malicious · 9675537669271e1a

MALICIOUS

PDF

1.6 KB

MD5: f961796cfe95f52b713391bcf6252e6f SHA-1: 2f357fa96d3ca00abc1de1ab7f6118e2ee0f025d SHA-256: 9675537669271e1aba6c89340c3dbec1f506500af3ca63e3105f9b4aebe9db7b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream contains an eval() call and uses String.fromCharCode, indicating obfuscation. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, as suggested by the presence of an extracted JavaScript file.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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_obj0009_000.js` `309e2f8b90d85bc2fa14c14a707e958165159220b2e18c489580eeec9f749186`	pdf-javascript-stream	PDF /JS object 9 at offset 0xDC	3767 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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