Malicious PDF — malware analysis report

Static analysis result for SHA-256 04254c9781edb7d4…

MALICIOUS

PDF

13.6 KB First seen: 2026-05-08
MD5: 3df1d7faec608f8d64ef571057586846 SHA-1: b0c6670c1f380ece810e8f62a175e8c9896ecefa SHA-256: 04254c9781edb7d42beeb612cc78c21043f8bfeea952dd5598ea340285f0b85c
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded active content and malformed streams, strongly indicating an exploit attempt. The ML classifier also flagged it with high confidence. While no specific script content is visible, the presence of embedded files and malformed streams suggests it's designed to download and execute a secondary payload, likely delivered via spearphishing.

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 0xD1 13150 bytes
SHA-256: 7d2ee426ca3a6b2ab5052313cd1bfed05aff2b34adf935a64d57c9467cd4e26a

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