Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76ee4e54279decb…

MALICIOUS

PDF

92.6 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: ac1d770b1c712a0b163b88d4f1081733 SHA-1: e4330c925ab4d935c26d410791fce2464fc58999 SHA-256: a76ee4e54279decb89bfe1a74e3c2220559773751845884b3b5cdd02b7261966
158 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, including calls to eval() and unescape(), indicating obfuscation and potential malicious activity. A secondary embedded PDF was also found with similar suspicious findings. The primary intent appears to be the execution of obfuscated JavaScript, likely to download and execute a secondary payload, as suggested by the heuristic firings and the presence of embedded scripts.

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_off0001591f.pdf
09d2c19f0884f4efeedfb4bfb3571db3facec7f05c4e32b5506e1fe942f16384		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1591F 6425 bytes

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