Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a23cc1efee5334…

MALICIOUS

PDF

15.8 KB
MD5: df4f243677b9431f80372b111cee881e SHA-1: 214a6041441f6f354fbfd90cc8ec332496910a0b SHA-256: d2a23cc1efee5334cdf81d99fe3ac788a7baf267c9b3e51c8b89a9aad2b264f6
68 Risk Score

Malware Insights

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

The PDF file contains an embedded script payload, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic. The ML classifier also flagged this PDF as malicious with a high score. The presence of XFA forms and embedded files suggests a complex document structure designed to conceal malicious activity. The embedded script is likely responsible for executing the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9799

Heuristics 4

  • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_000002da.bin
a3b7ac96ad6fb2745dcbd95da6b5de22b2b2436cdaf5efc3be4d73190c44b094		 pdf-embedded-script PDF decompressed stream script payload at offset 0x2DA 14234 bytes

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