Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec673f055fa4ffe7…

MALICIOUS

PDF

15.1 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 5018cb44ff1c545d26a5671aefc60267 SHA-1: d362ebf4baeca9287e8504b94e4240d44a82ab26 SHA-256: ec673f055fa4ffe78648046c9cae18bb87bd72c473637fbde2b504dc1a11f956
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The file was detected by ClamAV as 'Pdf.Dropper.Agent-7012473-0' and an extracted artifact was also flagged by ClamAV as 'Win.Trojan.Agent-36166'. The presence of PDF JavaScript actions and embedded JS streams, combined with a high ML score for maliciousness, strongly suggests this PDF is designed to execute malicious code. The exact function of the JavaScript is not fully discernible due to potential obfuscation, but its presence is a critical indicator of malicious intent, likely for dropping further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-7012473-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7012473-0
  • 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
680c8ca8c0e5a601178bb44910ee33a64e6b0cbe3b28791a96f2fb9b5d1983c0		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 83831 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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