Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38c243ddba77578…

MALICIOUS

PDF

9.9 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: ba147be9ba8f9001795e6d997ac591d9 SHA-1: 218a4937567cccf3c806fd1119e188b7dbdb22c4 SHA-256: d38c243ddba7757844d36dd41de54154f9d18c67ea3930cf5eab0e4d1b41fee3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream includes an eval() call, indicating obfuscated code execution. This pattern suggests the script is designed to download and execute a second-stage payload from a remote source. No specific family could be identified due to the obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
a7270043d943f9782768a61965a752e6f91e215856a2b67c3e1577206a5100e4		 pdf-javascript-stream PDF /JS object 17 at offset 0x1256 337 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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