Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bb1aa7eda4a70b…

MALICIOUS

PDF

45.0 KB
MD5: 8c8bbf102bec12ee5562cb766527a9ff SHA-1: 2fe2ecd2351366518c3770a243d81f69c77a485e SHA-256: 09bb1aa7eda4a70bf03f8e02d7db2ab76bf5677d6eff750886aed2563e3593fb
166 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Exploit.Agent-36128' and by an ML classifier with high confidence. It contains embedded JavaScript streams that are heavily obfuscated but appear to be designed to execute code. The primary function of the JavaScript is likely to download and execute a secondary payload, a common technique for exploiting PDF vulnerabilities.

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
58838a23a2ca5295a1cc62c58ba6c1c32fab403ef9ed1d9c52ce122e25020a99		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
36dc1e8ba7ee2237aa33481b5f51f81bcdd7dd71e60b0257f7edac338e1d992e		 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
497b38036e8aaffc58daf860d7e2744d34893ef7026cab2a617f74d11f72fd9a		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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