PDF malware analysis — malicious · 29b3f07a88413e7b

MALICIOUS

PDF

39.2 KB Created: 2011-01-28 10:59:41 +02:00 Authoring application: Loans Interest Rates (via mPDF 5.0)

MD5: 81d427ff0cf6b3d632812a123dc1f089 SHA-1: 35dc38cd58f3a9c64d3793287ab2e53d4b3ff499 SHA-256: 29b3f07a88413e7b35083ada631727ed57bcff81d627c65490f6a1cb8956b87c

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams that are heavily obfuscated using hex escape sequences. The heuristics indicate suspicious JavaScript actions and unescape calls, suggesting the script is designed to download and execute a second-stage payload. The obfuscation makes it difficult to determine the exact nature of the payload or its final destination, hence the unknown family attribution.

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 0x9595	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 0x9595	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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