Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe63f8640f96d6e6…

MALICIOUS

PDF

6.1 KB Authoring application: Favib rela (via Pipnolpamok)
MD5: 46110e505be37ae167ca2a20324e07f4 SHA-1: 8fce9c0bba34da11ea8832c5fc23364e92b0ecee SHA-256: fe63f8640f96d6e665762818b799d8a9b4f8f54b7b464eeb0321d4177aeeccb6
136 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. ClamAV detections (Pdf.Exploit.Agent-36174) confirm its malicious nature. The embedded JavaScript is likely responsible for exploiting a vulnerability within the PDF reader to execute arbitrary code, leading to the observed malicious verdict. The exact behavior of the script is not fully discernible due to obfuscation, but its presence is the primary indicator of compromise.

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-36174 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36174
  • 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_obj0015_000.js
d2679f3f15d6e025ee8c17fa18b94c5a0f309ff0925fe97138da94e5b5bbdf34		 pdf-javascript-stream PDF /JS object 15 at offset 0x1281 1504 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36174
Obfuscation or payload: unlikely

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