PDF malware analysis — malicious · 9dac0b55b3511670

MALICIOUS

PDF

2.5 KB

MD5: 08af11233703e488a6fd7dd6e976c3ba SHA-1: 0b4ba213126ce8419e495e7d22d59b6b67150af4 SHA-256: 9dac0b55b3511670b3493b7e85b3f1207c92173fb9cc8f708e72c2cab5a88a04

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The presence of PDF_EVAL and PDF_FROMCHARCODE indicates that the script is likely obfuscated and uses dynamic code execution. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript, specifically javascript_obj111712_001.js, is the primary mechanism for delivering the malicious 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `1bdc0c979f675e66964f9b1b62bc65f7bf9ae210ad1b1c78856a7d2e21867ded`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2440 bytes
`javascript_obj111712_001.js` `a893581b6daa0454775165f58ea3a1437997da75158b4a9cfc4a808094d3605b`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x829	624 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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