PDF malware analysis — malicious · aa984f4ae8365133

MALICIOUS

PDF

5.1 KB

MD5: f2b493b4372deffe93ad13a2f595736f SHA-1: 0e4c59d6106091a9828bad9fb723e8be7fcdfe37 SHA-256: aa984f4ae8365133139bf48a5f22029fbefffc412aff6ee902fd5ae8867d0411

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier as malicious and contains embedded JavaScript. The JavaScript stream exhibits obfuscation techniques, including the use of eval() and String.fromCharCode(), which are commonly used to hide malicious code. The presence of these indicators suggests the script's purpose is to download and execute a second-stage payload. No specific family could be identified due to the obfuscation.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj726315_000.js` `2906d5acf94a0e8eef0d2475cd864ebc133daa213f706490f49e5a928e65478d`	pdf-javascript-stream	PDF /JS object 726315 at offset 0x134	8356 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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