PDF malware analysis — malicious · 71f8826c86e2e77d

MALICIOUS

PDF

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

MD5: 5edddee3b5a047a9569379f8ce66d579 SHA-1: 7aee8a662dbab85b5678775814fa26ce5bac365d SHA-256: 71f8826c86e2e77d7f79426b10e2a96da622dcc9ce4d15075eb5910cba10e323

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV specifically detecting it as Win.Trojan.Agent-36166. Embedded JavaScript, obfuscated with string manipulation, is present and likely responsible for downloading and executing a second-stage payload, a common technique for this type of threat. The presence of JavaScript actions and embedded JS streams points to exploitation for client execution.

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` `821be3100057d642c6ebee558350a26e265e7f10b4e4f7d5ae49d8510e293cee`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	83668 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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