Malicious PDF — malware analysis report

Static analysis result for SHA-256 266fa2530bf5809b…

MALICIOUS

PDF

53.1 KB
MD5: 0299b28dde656e4f981a37816fff17ae SHA-1: 9be7de6daa7b7b99c9ab0db5e6197f1a7b3a5013 SHA-256: 266fa2530bf5809b3119ae5245a398c8144bc4392c7ade65e4a69e9bb3791f92
106 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious Attachment T1566.002 Phishing: Spearphishing Attachment T1059.007 Command and Scripting Interpreter: JavaScript

The PDF contains embedded XFA forms with risky executable scripts, as indicated by high-severity heuristics. The ML classifier strongly flags this PDF as malicious. While no specific document body content or script was directly readable, the presence of XFA and embedded scripts suggests an attempt to exploit PDF vulnerabilities, likely leading to the download or execution of a secondary payload. The embedded URLs are benign or unknown, providing no direct IOCs for the malicious payload itself.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
9b79a4ada5e0011e1048c1ec89c3e71770f1f3e4cec7577fb92ac8e01e31c0ea		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 53625 bytes

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