Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffec19b627f86ed…

MALICIOUS

PDF

45.4 KB
MD5: 43a1edb0fe28162c0f39ec4557e95491 SHA-1: c5104c96d1147a123c120997d0fe9b2e6563815d SHA-256: 7ffec19b627f86edb611cfe072c494fc7c11156f53b0383e1bd81090f8747f85
236 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains obfuscated JavaScript, identified by multiple critical heuristics including PDF_OBFUSCATED_NAME_OBJECT and PDF_JS_EXPLOIT_CLUSTER. This JavaScript is designed to exploit a vulnerability, likely within the XFA form processing, to achieve arbitrary code execution. The embedded JavaScript stream is heavily obfuscated, making its precise payload difficult to determine, but its presence and the exploit cluster signals strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9615

Heuristics 7

  • Hex-obfuscated scripting name object critical PDF_OBFUSCATED_NAME_OBJECT
    A PDF name object that drives script execution (/JavaScript or /JS) is written with #XX hex escapes to hide it from string-based scanners — e.g. /J#61v#61S#63r#69p#74 decoding to /JavaScript. Legitimate PDF producers always write these names literally; hex-encoding an executable name is a deliberate evasion used by exploit-kit and dropper PDFs.
  • 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
aedda183fbed79ebe0a1492dc51c1360cc6e927e69799eda7cb5b699294edce0		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1EA 3810 bytes

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