Malicious PDF — malware analysis report

Static analysis result for SHA-256 69195472c5f87085…

MALICIOUS

PDF

8.0 KB
MD5: 090434c801c0de2de80f0018f1146b5b SHA-1: 2ebfe558512b3cabf45c91f3c5c23c3f9d48bced SHA-256: 69195472c5f87085a6ab037c8dc8eabd48a77f3a03822e159ef654e472380a8e
106 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript streams, flagged by multiple heuristics. The JavaScript code appears to be obfuscated but attempts to construct and execute a command. Specifically, it constructs the string 'var ybENPitgqA15 = /hi av haxosict;;' and then calls a method that likely executes it. This behavior is indicative of a dropper or downloader, aiming to fetch and run a secondary malicious payload. The ClamAV detection as 'Pdf.Dropper.Agent-9448474-0' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • ClamAV: Pdf.Dropper.Agent-9448474-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9448474-0
  • 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
67c9109f88dabfae82ed8389f06a5bc8c5625ab5f7fcf77bfe9c77e8b55105c3		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2578 bytes
javascript_obj0008_001.js
47c5ad5b03f02a5ba323801ab65ef73a10d41a799c5bf31eea261f3bf51d869c		 pdf-javascript-stream PDF /JS object 8 at offset 0x209 7671 bytes

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