Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc769e5f0f12a37…

MALICIOUS

PDF

5.2 KB Created: 2012-06-11 17:19:01 Authoring application: y3sa First seen: 2026-05-08
MD5: 3b6b759cc2f7074a3b77bd2ad5e3fae2 SHA-1: 85c3def02178f634b458fd659a0d1f056c0c23a0 SHA-256: 9fc769e5f0f12a373d652e54408e59ce679e423e864b70638914aa9a719a5242
76 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1553.005 Mark-of-the-Web Bypass

The PDF file contains an embedded JavaScript payload, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic. The extracted JavaScript file, stream_001_off00000319.js, is likely responsible for downloading and executing a second-stage payload. The PDF_XFA heuristic suggests the use of XFA forms, which can sometimes be leveraged for obfuscation or exploitation. The confidence is moderate due to the lack of specific indicators within the script content itself to pinpoint a more precise family or attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 8

  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/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_off00000319.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x319 61042 bytes
SHA-256: 2382783d26282a8329adfb2a02a8ee0b17a4eb32ddd48ba25262558cab62f46b
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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