Malicious PDF — malware analysis report

Static analysis result for SHA-256 884713e8122bc352…

MALICIOUS

PDF

45.6 KB
MD5: e1c8d596b759a176b29b7bdc96b033d8 SHA-1: 4ad9c4e1b1020b01acaaa77a80106752e903e916 SHA-256: 884713e8122bc352b6d822a41055061f75edcd4710f85e657431285ebd80dea8
236 Risk Score

Malware Insights

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

The PDF sample contains obfuscated JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_XFA. The ML classifier also flagged it as malicious. The JavaScript is likely designed to exploit a vulnerability within the PDF reader to execute arbitrary code, potentially leading to further compromise. The benign URLs extracted are likely unrelated to the malicious functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9595

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
0a09d6a486d94e619362642a3d60bf72aa21f6a5b3cc8bef15eb6eeb2c4e2556		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1F6 4019 bytes

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