Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73edd73a8aec916…

MALICIOUS

PDF

6.1 KB Authoring application: Favib rela (via Pipnolpamok)
MD5: 5774b585c764a83e27cccd4f0b9b9137 SHA-1: b6b2e51fe944eb363c989139b8439defc38bf96a SHA-256: f73edd73a8aec916d3b0c222e29529f9c0115609e51dfa2ea2bff51d66c184bc
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 detection as 'Pdf.Exploit.Agent-36174' strongly suggests malicious intent, likely involving exploitation of a PDF vulnerability to run the embedded script. The script's exact function is not fully discernible due to obfuscation, but its presence and the ClamAV signature point to a malicious exploit delivery mechanism.

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