PDF malware analysis — malicious · c9911095b5bf5ee2

MALICIOUS

PDF

39.2 KB Created: 2011-01-23 11:58:27 +02:00 Authoring application: Mortgage Loan Down Payment (via mPDF 5.0)

MD5: 2b815dee0e0de9400130f059c3d94d67 SHA-1: 7fc1c56cc3915235c2be429a7acc31ae130f46d4 SHA-256: c9911095b5bf5ee25e25d6aa005df60a23a1db6f4f9505846d01fba88e5dffb9

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier as malicious and contains obfuscated JavaScript streams. The heuristics indicate the use of JavaScript actions and unescape functions, suggesting an attempt to hide malicious code. The extracted JavaScript files, 'javascript_obj0027_000.js' and 'javascript_obj0027_001.js', are likely responsible for downloading and executing a second-stage payload, although their exact functionality is obscured.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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_obj0027_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 27 at offset 0x9456	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_obj0027_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 27 at offset 0x9456	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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