PDF malware analysis — malicious · da5ed7241564ba57

MALICIOUS

PDF

51.7 KB Created: 2011-02-03 12:46:38 +02:00 Authoring application: Ship Loans Wiki (via mPDF 5.0)

MD5: 20808f3a1b2b78d389054a01d0761360 SHA-1: 3a87acb597d7f2567c2ff7eee9af97ae2fb24a7d SHA-256: da5ed7241564ba57fe4633a2a60a7c427effde5a7ad7072a08ade1e151a2faf8

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript streams, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flagged this PDF as malicious. The presence of unescape() calls and obfuscated scripts suggests an attempt to hide malicious functionality, likely to download and execute a second-stage payload. No specific family could be identified, but the techniques used are common for PDF-based malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9930

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0034_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 34 at offset 0xC706	136 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
`javascript_obj0034_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 34 at offset 0xC706	134 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).

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