Malicious PDF — malware analysis report

Static analysis result for SHA-256 1509518010c8d61a…

MALICIOUS

PDF

45.4 KB
MD5: 2d498a3cc3464ef0d7808523b203fea1 SHA-1: b034f2324d38b7cd4b12e2687c3429a6809e7d92 SHA-256: 1509518010c8d61a37031bd0528eed9d965ef6f3f40bf245f0d75a2ebe38df8d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, identified as an exploit cluster targeting XFA forms. This script is designed to download and execute a secondary payload, indicating a malicious intent to compromise the user's system. The presence of PDF-specific exploit heuristics and ML classification strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9401

Heuristics 6

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • 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
a7adbff3f09afdc048bdde70954a4901e9c9524b3e271ef68a487656023df077		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1F5 3828 bytes

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