Malicious PDF — malware analysis report

Static analysis result for SHA-256 944cf28215fc83eb…

MALICIOUS

PDF

12.1 KB Created: 2011-02-01 17:03:58 +02:00 Authoring application: Acrobat PDFMaker 7.0.7 for Word (via Acrobat Distiller 7.0.5 (Windows))
MD5: 0c18482e72f1fdf179249b73c09f3e64 SHA-1: 8157fd98b0619b293bb683911ffa4862eca500f3 SHA-256: 944cf28215fc83eb65712eb314a226fa39085c625759dbdc19e2af82adb8e9b7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

This PDF file contains embedded JavaScript, with a high-confidence heuristic firing for an eval() call, indicating obfuscated code execution. The ML classifier also flagged this PDF as malicious with a very high probability. The primary intent appears to be the execution of malicious JavaScript, likely to download and run a second-stage payload. No specific family could be identified due to the obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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_obj0027_003.js
8d3d52558fbb283404103f3dbb921869b261bc349343a86c4ecc9c251410c861		 pdf-javascript-stream PDF /JS object 27 at offset 0x576 33 bytes
javascript_obj0021_004.js
ba9b05eea6ce6b9e416e1337e090bccd0eb6eb0fc8a41c89986e2d662e70c186		 pdf-javascript-stream PDF /JS object 21 at offset 0x14BE 7035 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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