PDF malware analysis — malicious · 5bdeba94b54cfa48

MALICIOUS

PDF

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

MD5: 2eae74e360cc36f89e6d289254b8140c SHA-1: 708a028d1d0f8f6e41d556f2da7306b6a45b2650 SHA-256: 5bdeba94b54cfa482d8a285d9a6b503b29fce08d6665d8e6d65db2e76ba441bc

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, identified by heuristics and a high ML classifier score, which is a common technique for delivering malware. ClamAV detection confirms this is a known malicious agent. The JavaScript is heavily obfuscated, but its presence and the overall detection indicate it is designed to download and execute a secondary payload, likely exploiting a client vulnerability.

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` `9551db17daee702ad5a67ba85ca6dbc56ebf023293b585afac9ea8d0f85e39e6`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74249 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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