Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3ddb8189b53b85…

MALICIOUS

PDF

45.8 KB
MD5: a7c295130159532d843f5c6835ac2251 SHA-1: 4b5f129ea233a88f810f91610b0ddfdc472a86b1 SHA-256: 0b3ddb8189b53b85291fdd22c2bd527ba87e5c4f6cbb1cb6f1f08cb570b8bf0b
176 Risk Score

Malware Insights

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

The PDF sample contains embedded JavaScript, identified by multiple heuristics as malicious and exploiting a PDF XFA form. The JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The benign URLs present are likely decoys or part of the XFA structure, not indicative of the malicious payload's origin.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9647

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
cff1836bde3fc01b986488ddae3267e987bf8b46dd4f3cb84f070a16c8de3877		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1FD 4239 bytes

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