Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb7da98674cd16a…

MALICIOUS

PDF

114.3 KB Created: 2011-03-07 12:14:18 +08:00 Authoring application: 376377000P000D000F000C000r000e000a000t000o000r000 000V000e000r000s000i000o000n000 0000000.0009000.0003 (via AFPL Ghostscript 8.54)
MD5: 38b52b143c386986bb322f8e57f20426 SHA-1: 664fd3a3fc856b46d21089cece3b6551c56ba331 SHA-256: 5bb7da98674cd16a423a595f6094755b426b3b7b895abd8de6cca76899ca9ab1
232 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript and exploits known vulnerabilities (CVE-2009-4324 and CVE-2008-2992) that are commonly used for client-side execution. The embedded JavaScript, although obfuscated, appears to be designed to download and execute a secondary payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 9

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (matched in decompressed stream)
  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (matched in decompressed stream)
  • Secondary embedded PDF body has suspicious static findings high 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.
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0006_000.js
e7c24cdfeae8e2f07c270ef1b33093c3cdb02d42d38bebf0f2338ea515efb8c9		 pdf-javascript-stream PDF /JS object 6 at offset 0x12D 15946 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).
font_00_sfnt_off0001bbac.bin
081ecf34f0f9c4625d895ad77040209b0c7d6200262a655b7cdeeeb382caf03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBAC 86008 bytes
polyglot_child_pdf_off0001b506.pdf
5b43e381edd62f952f4831092b19db44e77759fd4bab1a3413a67c72ed22ace6		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1B506 5170 bytes

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