PDF malware analysis — malicious · 348dc68d791c78b1

MALICIOUS

PDF

26.1 KB Created: 2011-72-51 03:25:00

MD5: c1d3571edca207472a25991cd740aa46 SHA-1: a9fe9d9cfe1e00a24463ff0d8215c7a784a979ce SHA-256: 348dc68d791c78b115b8fe384897690234927a5889ab6d1df422326bfc371335

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, which is flagged by multiple heuristics including a high-confidence ML classifier. The JavaScript stream is obfuscated and uses an eval() call, indicating it's designed to execute arbitrary code. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the ML_NYX_PDF_MALICIOUS heuristic and the presence of an obfuscated JavaScript object.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
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_obj0001_000.js` `4a51b538b53aebb68f280eebc0adb330fb33f75d850fd2a5943946a519f7752e`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6457	847 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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