Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebb0e917bd8e9db…

MALICIOUS

PDF

13.5 KB First seen: 2026-05-08
MD5: 41a0aca1c2e8e8029c160b038fdeed79 SHA-1: 4721dc1758a10384f37add7b9111f79e7dce3481 SHA-256: 4ebb0e917bd8e9db328c944c698a7adc4d161f8bc4665f37acea3a7c6e67e238
70 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics commonly associated with malicious documents, including embedded files and XFA forms. The presence of an embedded script payload suggests an attempt to execute arbitrary code. While the document body is heavily obfuscated and unreadable, the embedded script and PDF structure point towards a potential exploit or downloader. The extracted URLs are related to XFA schemas and Adobe, but their reputation is unknown or benign, offering limited direct threat intelligence.

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 13136 bytes
SHA-256: 7b60c6e65a0f06b2c736497e37c1e66558d3255ac5310f978e6ec7a237f760a6

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