PDF malware analysis — malicious · 55b0871640d1d016

MALICIOUS

PDF

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

MD5: e7bc47b8ab006b31dd91a7890e333207 SHA-1: 2572ab49ce9583158a8d2830934c65ca2a791a19 SHA-256: 55b0871640d1d0169bb249f3e038d46ba051adddde0039b7828c0566dd12ed61

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious content. Specifically, it contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or delivering secondary payloads. The ClamAV detection of 'Win.Trojan.Agent-36166' strongly suggests a trojan agent, which typically downloads and executes further malicious code. The document body was unreadable, but the presence of JavaScript and the ClamAV signature are sufficient indicators of 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` `98ad1923c1d88e6ae43c8ff85822f02e9e17ecdf2df32b06dc44fa89de4eb33d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	84382 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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