Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4ec160d70c4df3…

MALICIOUS

PDF

45.0 KB
MD5: 838da2608e2358ff5af4ed457e9b0629 SHA-1: f1e0af7fa4ef705e185509eb3d529521cd5840c4 SHA-256: 5e4ec160d70c4df3e9ec8109164b8586ca57ce051915a7f7c8cf1937562bbba7
166 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Exploit.Agent-36128 and ML classifiers indicated a high probability of maliciousness. Embedded JavaScript streams were detected, and analysis of the deobfuscated script suggests it is designed to execute arbitrary code, likely by exploiting a vulnerability within the PDF reader. The script's complexity and obfuscation indicate an intent to download and execute a further stage. The presence of JavaScript points to T1059.007, and the overall execution flow suggests T1203.

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
58d3d700708a016ec06484a809c5cd3002a7b798f158fcc75670a2c58def3be1		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
88c6b7a9ef15d3b49936d9f5c50ab459c1c8f618746abd55452813995a4b3457		 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
d9280bbcd3cfbb58a06067f66561944493f56ed53b5beae33189769efb4d8d7e		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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