PDF malware analysis — malicious · 81dd96e754e1072d

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: 24b37d12911a1786496ee7fee9d560b2 SHA-1: bbc0658da9812a76c04739c3b776f6cf462605ab SHA-256: 81dd96e754e1072d541258172d9fc369fd1949f89f676c14650792648def0a77

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by multiple heuristics and ClamAV detection as malicious. The JavaScript is heavily obfuscated but appears to be responsible for downloading and executing a second-stage payload, as indicated by the 'Win.Trojan.Agent-36166' detection. The ML classifier also strongly suggests malicious intent.

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` `63b3ed0c7e22ebfd94b6f619996a5da1d06a90eae851ef42c184f411a46ee0ad`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75178 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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