PDF malware analysis — malicious · 5b783d501a45d626

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: d3e723c96bfbf9a0946db8704e3a54de SHA-1: c1704e6a61d20a2fd590684227db5c7cbf4889c4 SHA-256: 5b783d501a45d6262c2527a8a6e4f52398bf8db1a5f0b5f37fc92b7573a021bd

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, identified by multiple heuristics and a critical ClamAV detection (Win.Trojan.Agent-36166). The JavaScript appears to be obfuscated but is designed to download and execute a secondary payload, indicated by the string concatenation and the overall malicious classification. This strongly suggests a malicious document intended for initial compromise via spearphishing.

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` `fbb2a62bab4349b97916e2a33a4bf05ce52c79017aa20df53d2ee32c307e2849`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75201 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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