Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3863118b0ecef1…

MALICIOUS

PDF

45.5 KB
MD5: b78ff651e5228758d57160fe3b819005 SHA-1: cede5efb44b29a52ed19b0d0e25b78deb3e8b97a SHA-256: aa3863118b0ecef1336fab5b9f7cdf371c6fa72eba5ff0afae29c273da382c88
84 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1559.001 Component Object Model

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ClamAV detection for 'Heuristics.PDF.ObfuscatedNameObject' further suggests malicious intent. While the document body is heavily obfuscated and unreadable, the presence of JavaScript points to an attempt to execute arbitrary code. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, though its exact function cannot be determined due to obfuscation.

Heuristics 5

  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
525ae5d512f2c02f85b6ca416e4a7d2a4ae0f95fb11620079636114c5166c8c1		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1F6 3905 bytes

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