PDF malware analysis — malicious · 1912f4bfb3253953

MALICIOUS

PDF

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

MD5: 10938542552b9e1f8e5de4a423f7ad4d SHA-1: 9ae2c37eb462dcf535c9dd95ab755ad3d79b5496 SHA-256: 1912f4bfb32539537adcd7235b968574da83054e944276136ac825422036431c

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection identifying it as Win.Trojan.Agent-36166. Embedded JavaScript was detected, which is commonly used to download and execute further malicious content. The ML classifier also provided a very high confidence score for maliciousness. The presence of JavaScript and the ClamAV detection strongly suggest this PDF is a delivery mechanism for 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` `581b1c2f7952f1e719dec2b8c0290363e29dd3731913aff0b2caaa3522a45b2d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74964 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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