Malicious PDF — malware analysis report

Static analysis result for SHA-256 853da93fa2b67702…

MALICIOUS

PDF

7.5 KB Authoring application: Jgaxivakafowizasi (via d8721Uohosicilab)
MD5: c39a7de71efafbbb0c83aa0760d3d3d4 SHA-1: d4ba6fa343d392cccb8c633b2f283a51352f5a57 SHA-256: 853da93fa2b6770277e4de3468eb7c903a5245040f4fc8eca4aa33e6b512627b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_OBFUSCATED_NAME_OBJECT' and 'PDF_JAVASCRIPT'. The embedded JavaScript is designed to execute, likely for the purpose of downloading a secondary payload. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 4

  • Hex-obfuscated scripting name object critical PDF_OBFUSCATED_NAME_OBJECT
    A PDF name object that drives script execution (/JavaScript or /JS) is written with #XX hex escapes to hide it from string-based scanners — e.g. /J#61v#61S#63r#69p#74 decoding to /JavaScript. Legitimate PDF producers always write these names literally; hex-encoding an executable name is a deliberate evasion used by exploit-kit and dropper PDFs.
  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0011_000.js
c35f939b8b08b4458e4f2307d4bfd0afc23546c955e11c1da88e87302e40c9b0		 pdf-javascript-stream PDF /JS object 11 at offset 0x1358 3029 bytes

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