Malicious PDF — malware analysis report

Static analysis result for SHA-256 7442143eef1c810e…

MALICIOUS

PDF

69.6 KB
MD5: 2f6db56beb89e8f21fb3f6cf1594a064 SHA-1: 63d163501b27e00a59b6b2fd94a4a6ab8f706809 SHA-256: 7442143eef1c810ed17a3a0fed016f2e53f543449fab3a02847fd114fa1b175f
168 Risk Score

Malware Insights

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

The PDF contains obfuscated JavaScript, flagged by multiple heuristics and ClamAV, indicating malicious intent. The embedded JavaScript is designed to download and execute a second-stage payload, likely from the provided URL. The ML classifier strongly suggests maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 5

  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.bitstream.com

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
a8b370251247829a40fe029ce0dd8a0f7c864cd1beb7e01efea0ab373c0e1d5c		 pdf-javascript-stream PDF /JS object 12 at offset 0x10628 3554 bytes

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