PDF malware analysis — malicious · e811bec8fa2960e9

MALICIOUS

PDF

28.5 KB Created: 2010-03-16 04:18:28 Authoring application: LooXrkH (via O68gEIT6RR5FeT)

MD5: df8a5684cb02cf413d7256f877b35311 SHA-1: b7764a155ebfa77c9bf0f3ffc7f54a296186ba6b SHA-256: e811bec8fa2960e9af8b7cd1667d3c5a91afec92541d7016e62eb55a8182690f

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also flagged this PDF as malicious with high confidence. The embedded JavaScript, named javascript_obj0007_000.js, is likely responsible for the malicious behavior, potentially downloading and executing a second-stage payload. The use of eval() and fromCharCode suggests obfuscation techniques were employed to hide the script's true intent.

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.
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` `a484b94f5072b62669ea1089262c77a287c3ebfcdc707cb855c5059b7e83b471`	pdf-javascript-stream	PDF /JS object 7 at offset 0x238	27919 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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