Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d72fa09b024624…

MALICIOUS

PDF

13.3 KB First seen: 2026-05-08
MD5: 4d325948dacd3ae3d6baa2682c04435f SHA-1: 9a1e78bd6268bfa48c4f95a846d506f0ab96654e SHA-256: 52d72fa09b024624bf8acbd8a33838fab0bcb006a381027d48c906675962e416
70 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution

The PDF contains an embedded script payload, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic. This suggests an attempt to exploit a vulnerability within the PDF reader to execute malicious code. The embedded file, 'embedded_file_obj0008.bin', is likely the payload. The XFA form heuristic also indicates a potentially complex document structure that could be leveraged for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 script payload in PDF stream info 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 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/ In PDF document text
    • http://www.xfa.org/schema/xci/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.5/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD5 12885 bytes
SHA-256: 952e9242d8b73edd60426029b2317bae2384268855a6a057d0f68f8f7be17a9c

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