Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5ab3668bd41adf…

MALICIOUS

PDF

143.8 KB Created: 2010-03-23 09:37:50 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 6.0.1 (Windows))
MD5: 65b0043c54abb21bbb4582f043ecb701 SHA-1: cc59067282fa827201be36299e3c03ac9e103052 SHA-256: 3b5ab3668bd41adfb228879cb2b2b9b36ca0be6e772aa48d7e3c951120c07d96
158 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, including calls to eval() and unescape(), which are commonly used for obfuscation and execution of malicious code. A secondary embedded PDF was also found with similar suspicious findings. The primary function of the embedded JavaScript appears to be the exploitation of PDF vulnerabilities to download and execute further stages, indicated by the presence of obfuscated JavaScript and a child PDF artifact. The benign URLs extracted are not indicative of malicious activity.

Heuristics 7

  • 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.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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/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_obj0013_000.js
8c9f42a4bc8bc39e293d422c1c3afbdeb24e741c550db5782105e90bac6a8842		 pdf-javascript-stream PDF /JS object 13 at offset 0x3C2 4682 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 16 eval/decoder/string-building token(s).
polyglot_child_pdf_off00022614.pdf
c91c36519becb189da17f0c4bdbba22491c3d3d6608a9813c5e24ba8c334c7ba		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x22614 6428 bytes

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