PDF malware analysis — malicious · 369723cbf3a46881

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: d7e38d04a1f7a95dea396aed11476db2 SHA-1: 04a7c58d75a8bd604b77bff96a6ad62ef631728b SHA-256: 369723cbf3a46881472f8e129ffb6bc9e47744c64e2f9a71ef968b067a2b36ee

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as malicious by ML classifiers and ClamAV, with ClamAV identifying it as 'Win.Trojan.Agent-36166'. Heuristics indicate the presence of embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The embedded JavaScript likely serves to download and execute a second-stage payload, contributing to the overall malicious nature of the file.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `db93aa4e78bd51d1f82283635ab00358361610549c1e877e8e5728c925af6703`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74337 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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