Malicious PDF — malware analysis report

Static analysis result for SHA-256 094a1a0f85a736d6…

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: 766ac6d74fadb18cdda1c098d8d4c020 SHA-1: ff42379bcf89646613c334f0d6089578f9f230cc SHA-256: 094a1a0f85a736d66c5b53d2ca8fc791528424ef16711f5d4d5ccddddf49b4f6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. Embedded JavaScript was detected, which is commonly used to download and execute further malicious content. ClamAV detections on the PDF and an extracted artifact suggest it acts as a dropper for a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Dropper.Agent-7685760-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7685760-0
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
232cc743e97ee2509f402513166be308f566d1a9d11ffbdb44af1e6c65e63cd3
pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 84179 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely