PDF malware analysis — malicious · aa975474d5a39361

MALICIOUS

PDF

14.5 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)

MD5: 310a2f0108f1f55680f764f8ad951148 SHA-1: a6bf480c2eecfe6dd31c67affa39ee201591242d SHA-256: aa975474d5a39361f40be25cc502fa36a798ad7edc1656532111eac5ae0d606a

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript

The critical ClamAV heuristic firings indicate the file is malicious, specifically identified as Win.Trojan.Agent-36166. The presence of PDF_JAVASCRIPT and PDF_JS heuristics confirms that embedded JavaScript is used, which is a common technique for delivering malicious payloads. The large embedded JavaScript stream suggests it is likely responsible for the malicious behavior, such as downloading and executing a second-stage payload.

Heuristics 4

ClamAV: Win.Trojan.Agent-36166 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36166
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `836721ad6890f646dad0e1bf683951297ac687756bbeb536716508d533b36f5c`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74795 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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