PDF malware analysis — malicious · 3193d4fa64920144

MALICIOUS

PDF

26.2 KB Created: 2011-01-23 11:45:59 +02:00 Authoring application: Auto Loan Down Payment (via mPDF 5.0)

MD5: cb4dcb6d1353d5819b91a0a06cd28d60 SHA-1: 03ca89a6664f3616d67e0592a2338e3a9f842794 SHA-256: 3193d4fa64920144a841607b2c9504ef3fe5bda8893d816c5adade899893b906

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams that are obfuscated using unescape() calls, as indicated by the high-severity heuristics. The ML classifier also flagged this PDF as malicious with high confidence. The presence of JavaScript actions and obfuscated scripts strongly suggests the intent to download and execute a secondary payload. The extracted filenames 'javascript_obj0020_000.js' and 'javascript_obj0020_001.js' are included as IOCs.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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_obj0020_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 20 at offset 0x6150	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_obj0020_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 20 at offset 0x6150	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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