Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7713a2e7191d97…

MALICIOUS

PDF

52.9 KB
MD5: ed55c8f3eb89c47b4b74b9e3b564470f SHA-1: ee99e46793e63a0b7f5e28f86bf53511cdf0ddb1 SHA-256: ac7713a2e7191d97f3b791c69b0e2ac2cd729afadc53674362f4e4dded6ec18c
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains embedded executable scripts, flagged by high-severity heuristics including PDF_XFA_SCRIPT and ML_NYX_PDF_MALICIOUS. The presence of an embedded file object further suggests a delivery mechanism for a malicious payload. The exact nature of the script's execution is unclear due to obfuscation, but it is highly likely to be involved in downloading and executing a second-stage payload.

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
da94a9ac5e1121537408b62ff01c9dc53606137fe032213850dadd8cb552e4c7		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 53425 bytes

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