Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eedc2948bf80430…

MALICIOUS

PDF

27.9 KB Created: 2013-01-29 13:45:06 Authoring application: bDdLHxK31 (via Fgh7EqgVcLT4AhMJ) First seen: 2026-05-09
MD5: 997ff77f7bf475bb71326a51ee88cba1 SHA-1: e0d9c33c92f0f34e61693c3fb861d51b8e4731c0 SHA-256: 0eedc2948bf80430a59dc4a52b400d351bc7b9d8e45dcff1e8be232f40b090b1
72 Risk Score

Malware Insights

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

The PDF contains malformed streams and an embedded file, strongly indicating an exploit attempt. The ML classifier also flagged this PDF as malicious. The embedded file, 'embedded_file_obj0016.bin', is likely the secondary payload that the exploit attempts to execute.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9512

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://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://fsf.org/&gtIn 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_obj0016.bin pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x174F 28815 bytes
SHA-256: be0e68b5274d5f105c6822d4dc506da5b80462a8e5e34591137d3e56a1ae9ae4
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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