Malicious PDF — malware analysis report

Static analysis result for SHA-256 991fe2d46eb056dc…

MALICIOUS

PDF

69.0 KB
MD5: e2ecb5ba76e08b9c72974a0c6959d47d SHA-1: e09c142fcf4a82824856e4b329b6ec542bce5ee4 SHA-256: 991fe2d46eb056dc6f6f22cb8dd0ccb18d70202bd7ecefacc782f31a5eece1b0
106 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript, 'javascript_obj0012_000.js', likely downloads and executes a second-stage payload from the unknown URL 'http://www.bitstream.com'. The document body is heavily obfuscated and does not provide clear user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 4

  • 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
82e8f9d52e90b163afb79c4d0c8c6dce5214b5e865026a04a6899ec4df5eceb1		 pdf-javascript-stream PDF /JS object 12 at offset 0x105F0 3039 bytes

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