PDF malware analysis — malicious · 76abc1b428c74b39

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: 99f98ba0dcc1b65d33ff02eae4e57891 SHA-1: eef87ef55c325aa59ca7426a99308c5f2e1f2599 SHA-256: 76abc1b428c74b3997d63cf09cd7e8c08792aeb7981a4eea0777842b493857d4

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by heuristics and ClamAV as malicious (Win.Trojan.Agent-36166). The JavaScript is heavily obfuscated but appears to be responsible for downloading and executing a secondary payload. The ML classifier also strongly indicates maliciousness. Given the nature of the embedded script and the ClamAV detection, the most likely attack pattern is a spearphishing attachment leading to the execution of a trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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` `0b93bf36ae7316db98dfccd65e2ac058a007b90e5723e1360b10d8bdaeef4ab0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75101 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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