Malicious PDF — malware analysis report

Static analysis result for SHA-256 865b80f11dfe8d17…

MALICIOUS

PDF

44.4 KB
MD5: 4bde59751da10badc36269ffb4a3971c SHA-1: 19463d7cc994f1f9abda342be3073f0ca4bebb4a SHA-256: 865b80f11dfe8d1741db754661a71122382e44475fdaa308a0c6f4f46a5d7066
236 Risk Score

Malware Insights

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

The PDF file contains obfuscated JavaScript, including hex-obfuscated name objects, and is flagged as an exploit cluster associated with XFA forms. This indicates the sample is designed to exploit a vulnerability within the PDF reader to execute arbitrary code. The JavaScript likely downloads and executes a second-stage payload, though the exact mechanism is obscured.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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
5db7eef4e91bf0663c8acf8888bc57e84d7903a13845509457f6fa2c2bb75a1d		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1DB 3044 bytes

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