Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f99660b66a1eae7…

MALICIOUS

PDF

35.5 KB First seen: 2026-05-08
MD5: 6b90e203b1662f494e681132cc663ef5 SHA-1: cca2fb6513b048cd61a24437ccafb392bd5ac6e9 SHA-256: 3f99660b66a1eae72cea6e080368a62ff2e69236e5fbf8153e1659d7901a947b
70 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The PDF file contains embedded content and an embedded script payload, indicating an attempt to exploit vulnerabilities. The presence of XFA forms and embedded files suggests a complex delivery mechanism. The embedded script is likely designed to download and execute a second-stage payload, though its exact function is obscured by obfuscation.

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 35603 bytes
SHA-256: f6720ab50340b5294a8b2899f506b1e5545b59ddef8610c842e29b3f59d8176c

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