Malicious PDF — malware analysis report

Static analysis result for SHA-256 0429c87e2a1a8f93…

MALICIOUS

PDF

28.5 KB Created: 2013-01-04 19:43:34 Authoring application: wtU2vTmxjKEdh6 (via hlZEqbcs) First seen: 2026-05-09
MD5: a2f5303702a007ac5815624b41a4a905 SHA-1: 77ef268139c26ca423720152bef2cf5b38992dea SHA-256: 0429c87e2a1a8f936c822ef7f6daccb0ef4e6d29f695e12afab62025ace132f6
72 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains malformed streams and an embedded file, strongly indicating an exploit. The ML classifier also flagged it as malicious. While no explicit script was found, the presence of an embedded file and malformed streams suggests it's designed to download and execute a secondary payload, likely leveraging a known PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9094

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://jquery.com/ In PDF document text
    • http://ns.adobe.com/xdp/In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.2/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://ns.adobe.com/xfdf/In PDF document text
    • http://www.xfa.org/schema/xfa-form/2.8/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0012.bin pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x1412 30225 bytes
SHA-256: bf06ba817f01f645822f3dc58f6d61185266ffef06982f79de4b89ac902c235f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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