Malicious PDF — malware analysis report

Static analysis result for SHA-256 04cb839e2f45645b…

MALICIOUS

PDF

1.9 KB Authoring application: sli
MD5: 0037f2f6ccc490464143202283fb6a7f SHA-1: aca20c9d1cb096210d4b33424a873c2802f81fab SHA-256: 04cb839e2f45645b990d693e672a53103fd1f0f911c89655c40b1bb636f0ab2a
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 that is obfuscated but appears to be designed to download and execute a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting a PDF vulnerability for initial execution. The specific JavaScript payload could not be fully reconstructed due to obfuscation, but its presence and the high detection scores point to a downloader or dropper functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • ClamAV: Pdf.Exploit.Dropped-91 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-91
  • 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_obj0076_000.js
efe1ffcf36f3acfc32b5cc47b19f6a5b09ce7de3d5834f17ed50454609c51efe		 pdf-javascript-stream PDF /JS object 76 at offset 0x426 548 bytes
deobfuscated.js
84446d20333423330f437f166e6d4a1bc847d2e1bdfc41729645456474ebfcec		 deobfuscated-js PDF JavaScript deobfuscation pass 1213 bytes

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