Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fd03d6ab8e4982…

MALICIOUS

PDF

105.7 KB Created: 2008-05-21 16:10:52 +08:00 Authoring application: Acrobat PDFMaker 6.0 for Word (via Acrobat Distiller 6.0 (Windows))
MD5: 6ddfcd6828014750296d9b6609221838 SHA-1: 8f74839778ac84f539e33dfd8e2d30a76010b0b1 SHA-256: c9fd03d6ab8e49823caa7bc168f96de2f1a40e13fb63ee871311496198bc1ce7
118 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_UNESCAPE. A secondary embedded PDF was also detected with suspicious static findings. The primary intent appears to be the execution of malicious JavaScript, likely to download and execute further stages. The presence of an embedded PDF suggests a multi-stage attack. No specific family could be confidently identified.

Heuristics 6

  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (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.
  • 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/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0031_000.js
aab2d86e5a5b6b544d66e9de934a28fb8c7803d2f7b110b365aa96120546ca15		 pdf-javascript-stream PDF /JS object 31 at offset 0x20B6 2883 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 19 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
polyglot_child_pdf_off00017002.pdf
008c4852030744ecdb7b72b54a13531912a8e8f4a2ab4269bec37a7551f75832		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x17002 14030 bytes

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