Malicious PDF — malware analysis report

Static analysis result for SHA-256 7503b636ccb021d2…

MALICIOUS

PDF

45.4 KB
MD5: f40f45735bb297b0aaefa9c27757df70 SHA-1: 0948c90d4373729118efa52eaf276ca163e2d1e5 SHA-256: 7503b636ccb021d2b803d6565a5cfa4a1eafaeec937d9a63d4d7cc56360ef364
236 Risk Score

Malware Insights

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

The PDF contains obfuscated JavaScript, identified by critical heuristics like PDF_OBFUSCATED_NAME_OBJECT and PDF_JS_EXPLOIT_CLUSTER, which is a common technique for exploiting vulnerabilities. The JavaScript stream itself is heavily obfuscated, making its exact function difficult to determine, but it is highly likely designed to download and execute a secondary payload. The presence of XFA form elements further supports the exploit cluster finding.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9647

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
7d9c1c5300ecdcaffdc9e3d043f40fede87cbf84550914c652715a63fa5188a2		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1FF 3980 bytes

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