Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94ae8851188e487…

MALICIOUS

PDF

265.4 KB Created: 2013-05-04 12:28:53 +02:00 Authoring application: Acrobat PDFMaker 9.0 pour Word (via Acrobat Distiller 9.0.0 (Windows))
MD5: 218078eb632c0ec53d20e23574a6c5ad SHA-1: 5086bd85825d7b70e131ed8da404b170c1adb987 SHA-256: a94ae8851188e4877fdfa8fbb9c67e3c96f018d383453b3ad2c37533e4a121f7
76 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

This PDF file contains embedded JavaScript, indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_EVAL heuristic strongly suggests that the JavaScript is obfuscated and uses eval() to execute arbitrary code. This is a common technique for downloading and executing further malicious payloads. No specific family could be identified, but the technique is indicative of a downloader or dropper.

Machine Learning

  • Nyx PDF Classifier clean score 0.2396

Heuristics 7

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • JavaScript action low 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.
  • Additional-actions dictionary low PDF_AA
    PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
  • Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT
    Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_004.js
554d71ae239c729756699818b8397f889b1f86a53fd6286ff76d6c9a8160b3d7		 pdf-javascript-stream PDF /JS object 1 at offset 0xF 1558 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 eval/decoder/string-building token(s).
font_00_sfnt_off00037978.bin
4d439bbde0a5bfc989d468259076482463e066714b1638ab5f1b85a4b405658d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x37978 5924 bytes

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