PDF malware analysis — malicious · f9f0307c2a05b1bb

MALICIOUS

PDF

1.3 KB

MD5: fdbe1d6435296f177b78693e921d391e SHA-1: 3dfc585c536fdec27f7db97d0a59213b06a9a963 SHA-256: f9f0307c2a05b1bb6d725604992b6c7d79db9296841b6b3dd0c225132d8c23d6

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flagged this PDF as malicious. The unescape() function was used, suggesting obfuscation of the JavaScript payload. The primary attack vector appears to be the execution of this embedded JavaScript, which likely downloads and executes a second-stage payload. No document body text was available for analysis.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj0005_000.js` `e43937dce98c55d60331ed94d83095d1722cfce3a968fb6679aaf1b691594cf1`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	1980 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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