PDF malware analysis — malicious · 117432e52dbc04f6

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: 00261bcb3f776c7930943e4044503f06 SHA-1: 049aa9ba42d159a7348d8c8305f4f6d9b230c0ad SHA-256: 117432e52dbc04f6cd27f47ac1788acea9ea766ee80c1ced6ce6e6c304f5597d

168 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, which is a common technique for exploiting vulnerabilities in PDF readers. Heuristics and ML classifiers indicate malicious intent, and ClamAV detection confirms it as a known trojan. The embedded JavaScript likely downloads and executes a second-stage payload, aligning with the 'Exploitation for Client Execution' and 'JavaScript' MITRE ATT&CK techniques. Given the nature of PDF exploits, 'Spearphishing Attachment' is a probable initial access vector.

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` `b7a574e7e99e95cd8e0f9da51cb2987c9d85a795283d7ecb0d1d1d3a92d947bb`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74659 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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