Malicious PDF — malware analysis report

Static analysis result for SHA-256 18422fb49a74d409…

MALICIOUS

PDF

4.8 KB Created: 2011-04-05 23:46:28 Authoring application: bufdfob First seen: 2026-05-08
MD5: 92f82467ac841a4027ade961fd9a054a SHA-1: bdb64719c8ed2ebe6b0c3e4aa843016722135da7 SHA-256: 18422fb49a74d40982c78535fd3d2837c6c2cf02058c668bddfd352abca28077
72 Risk Score

Malware Insights

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

The PDF file contains embedded content and triggers heuristics indicating it is malicious and potentially exploits a vulnerability. The ML classifier output of 0.999973 strongly suggests malicious intent. An embedded JavaScript file was extracted, which is likely the payload or part of the exploit chain. The benign URLs related to Adobe and XFA are likely artifacts of the PDF structure and not directly related to the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF embedded file could not be fully decoded medium PDF_EMBEDDED_FILE_UNDECODED
    A declared PDF /EmbeddedFile stream uses filters that the scanner could not decode. The raw stream was carved for artifact triage because malformed or unsupported attachment filters can hide payload content from normal extraction.
  • 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.
  • 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.
  • 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
stream_001_off00000309.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x309 13273 bytes
SHA-256: d08a8d6bf7b28d4c34fc8a7346d79852f1fbcc08748edbe867fa92034a8fd0bc

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