Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b45dec18e03bdbe…

MALICIOUS

PDF

13.4 KB First seen: 2026-05-08
MD5: 25fc896211f820f6e2dda17a92d73ead SHA-1: 71aa17390402979b2ae5caae138a527847661c02 SHA-256: 6b45dec18e03bdbe4c61f233060c5fdec5e14efd00a593e4512872427b475a53
70 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by an ML classifier and exhibits characteristics of an exploit, specifically a malformed active-content stream length. It also contains an embedded file, likely a payload, and benign URLs related to XFA forms. The presence of an embedded script payload and the malformed stream strongly suggest an attempt to exploit a client vulnerability for execution.

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/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 0xC6 13013 bytes
SHA-256: f1e40b4730449ee405cbe819faf99fe45c1bbbd5582a6ffe2bf226eac70f4890

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