Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5100dcdf1cce10…

MALICIOUS

PDF

44.9 KB
MD5: e883793590bf4fd9aef65c9405863a8c SHA-1: 29b5b3bf394725f10a2735609fa8482b11d140d5 SHA-256: ae5100dcdf1cce105bfb5808a46dced1fe12ca7f3a81b6100e9ac23f169bd3a4
114 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics, and is flagged as malicious by a machine learning classifier and ClamAV. The embedded JavaScript is likely responsible for executing malicious actions, such as downloading a second-stage payload or exploiting vulnerabilities within the PDF reader. The presence of XFA form elements (PDF_XFA) further suggests a complex, potentially malicious, document structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9364

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
56665d2c35b941412ae83fdb121dff3c369622dc521637d1edb991067835222c		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1ED 3366 bytes

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