Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de24a200943b31d…

MALICIOUS

PDF

45.0 KB
MD5: 3a5465f96addf05a7d1818ac89559c79 SHA-1: 4452851004d98155f6f4ba932c4f9090e98acd6e SHA-256: 5de24a200943b31d0fb70b05ed8cc89762a1e348fc39d92127afac612d528071
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and ML classifiers, specifically as Pdf.Exploit.Agent-36128. Embedded JavaScript streams were extracted, indicating an attempt to execute code. The JavaScript appears to be obfuscated but likely aims to download and execute a second-stage payload, a common technique for PDF-based exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-36128 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36128
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
253843ccc2efddb7ee93fbd5189a36db719eba4829e0f00edd73311317c0cb84		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
109148674a300369f3b837c27b47f22b2e0bfeb435986f11b61f5616a859effd		 pdf-javascript-stream PDF /JS object 8 at offset 0x20A 45555 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36128
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
1f1ac49dcf3c75e72500f90cb9af36cf098b827040d185dcfd85233560e52027		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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