Malicious PDF — malware analysis report

Static analysis result for SHA-256 4633f55eac52677a…

MALICIOUS

PDF

10.0 KB Created: 2011-01-28 17:10:49 +02:00 Authoring application: Acrobat PDFMaker 7.0.7 for Word (via Acrobat Distiller 7.0.5 (Windows))
MD5: 5741af44a334bceacd33dfd1a8cdd7b6 SHA-1: ed704057098269f84712590afc7ec00ddd1e6a27 SHA-256: 4633f55eac52677a2ea15048fc6b6b496d3e4c26ea0c27a2c2aab1f30232cfc2
66 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The eval() call within the decoded JavaScript stream suggests the execution of arbitrary code. While the specific payload is not fully discernible due to obfuscation, the presence of JavaScript execution in a PDF is a strong indicator of malicious intent, likely to download and execute a second-stage payload. No specific malware family could be confidently identified.

Heuristics 6

  • 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.)
  • 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/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0023_003.js
8d3d52558fbb283404103f3dbb921869b261bc349343a86c4ecc9c251410c861		 pdf-javascript-stream PDF /JS object 23 at offset 0x562 33 bytes
javascript_obj0017_004.js
b929b0764e160fedd46ed32d94cc228f7fac13b909c2c04f334cd8fc11b0525f		 pdf-javascript-stream PDF /JS object 17 at offset 0x1256 663 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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