Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5da9171f7eada0…

MALICIOUS

PDF

13.5 KB First seen: 2026-05-08
MD5: 560ec41e603364b544f46c1fd98ad1e1 SHA-1: 9a2174883ce703eec9e22b86421db473804096a9 SHA-256: 7a5da9171f7eada07f7a5b4c2e661c734ddb2744d11bd1cb6c96858bdca60bea
70 Risk Score

Malware Insights

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

The PDF exhibits characteristics of malicious exploitation, including malformed stream lengths and embedded script payloads. The ML classifier strongly indicates maliciousness. While no specific URLs were flagged as malicious, the presence of an embedded file and the overall structure suggest it's intended to download and execute a secondary payload, likely via an exploit.

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 13106 bytes
SHA-256: 3a4e4d50a831746d10f50055cc913b810c475ed42907221e879213590365cfd6

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