Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa82e42236f868f…

MALICIOUS

PDF

27.7 KB
MD5: 972055f3cec1517b14acd5e69e93d7e1 SHA-1: cd51e454ba47bd8a4dc10e1d198eae6a2c3aeaf0 SHA-256: 8fa82e42236f868f7093608b958389ecd355f1dae1f38ab4878560ca76510b01
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. The ClamAV detection of 'Win.Trojan.Agent-36100' strongly suggests malicious intent. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, which is a common technique for malware delivery. The document body content appears to be obfuscated or malformed, providing no clear user-facing lure.

Heuristics 4

  • ClamAV: Win.Trojan.Agent-36100 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36100
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
4657e9d54e2611dc454ef070b7a00e1c341742940c1e9673c740b88fd59c6628		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27621 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
08ed0b5fb20a6806887d64e62b673865a61bfb816a13a66eaae04315e6b1709f		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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