Malicious PDF — malware analysis report

Static analysis result for SHA-256 047199e69d6cdeb2…

MALICIOUS

PDF

13.1 KB First seen: 2026-05-08
MD5: 2507b4b0136fad041e299dd748bc962c SHA-1: ab4b53e095852a539164f01a82867de841564230 SHA-256: 047199e69d6cdeb252bb7bcc93aad064bc41d1046cc4e79c30d0a19341a9ab0a
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains a malformed active-content stream, flagged by heuristics as a potential exploit. Embedded JavaScript, reconstructed from obfuscated code, is present and likely responsible for executing a secondary payload. The ML classifier strongly indicates maliciousness, and the presence of an embedded file further supports this. The benign URLs are unrelated to the malicious activity.

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 12655 bytes
SHA-256: 89939c2b84896a52dc4b3e568cde8851b9df8abfda33bb5c427bd4f8a83f6c9c

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