Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58dbd2320c6a826…

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: 36dca05507733b46955c6cde0a04e4a4 SHA-1: e320f8fc0e0160caf8753b4e01826395e3db61c5 SHA-256: b58dbd2320c6a8267fee4637a23724ccbc4aa44dd58939b60dd767410b960bcf
138 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature Win.Trojan.Agent-36166. Static analysis revealed embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. This JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for malware delivery. The PDF structure and embedded script suggest a spearphishing attachment attack vector.

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.

FilenameKindSourceSize
javascript_obj0007_000.js
cb97686812eca4726fb51b653f9ac1603f42afda0f5506e1ae445e23f5e3d11d		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75191 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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