PDF malware analysis — malicious · d326287db5ddab29

MALICIOUS

PDF

39.7 KB Created: 2011-04-13 23:17:35 +03:00 Authoring application: Wiki Omni Loan (via mPDF 5.0)

MD5: 4f697cc1c06bb5efb182ae9b86151c1b SHA-1: 92be318b9b1b7c256f67c4092c8bf55ea0163ff4 SHA-256: d326287db5ddab296a9f3c6476b85bba933d7158710be3156fff4ea7be3ef8db

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript is obfuscated using unescape() calls, as flagged by PDF_UNESCAPE. The extracted artifacts, javascript_obj0029_000.js and javascript_obj0029_001.js, show signs of script obfuscation. This suggests the script's primary purpose is to download and execute a secondary payload, likely from a remote source, which is a common technique for malware delivery.

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_obj0029_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 29 at offset 0x9797	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_obj0029_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 29 at offset 0x9797	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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