Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f3ddb9aea3d743…

MALICIOUS

PDF

12.3 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: 23dbf7ed89dc35cae061fc172bf66490 SHA-1: 99640d4bbe384a76c3cd9e098393d7073de2150c SHA-256: c9f3ddb9aea3d743e268a6c526453711b44bc81ae331376d1844d6967ee795b7
98 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

This PDF file exhibits malicious characteristics, including embedded JavaScript and a high-confidence ML classifier score. The presence of an eval() call within the JavaScript stream, along with obfuscation indicators, strongly suggests the execution of malicious code. The primary intent appears to be downloading and executing a second-stage payload from an external source, facilitated by the embedded scripts.

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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0027_003.js
5ab6d2f56aeee90bf2e1b5c7b112a7f6fab39a11636d9678a30de8b252aff6cf		 pdf-javascript-stream PDF /JS object 27 at offset 0x57C 129 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
javascript_obj0001_004.js
8d3d52558fbb283404103f3dbb921869b261bc349343a86c4ecc9c251410c861		 pdf-javascript-stream PDF /JS object 1 at offset 0xA45 33 bytes
javascript_obj0021_005.js
7950b9f14a8ecb0ea89a76ea16ea72dd79b6b22f4f5560c8d3a39311ad8b438c		 pdf-javascript-stream PDF /JS object 21 at offset 0x1541 7186 bytes

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