Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f401fe081ee6c21…

MALICIOUS

PDF

274.0 KB Created: 2010-12-28 14:57:53 +08:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.3 (C++/Win32))
MD5: f484a0e0bb122ac911b79941280fe742 SHA-1: 4409d88dd559cb4687de75c2357213cd8632d408 SHA-256: 9f401fe081ee6c21ad774fd2bc2c13530138496b3435d827e91de36d293e9ddb
192 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript and triggers multiple critical vulnerabilities (CVE-2009-4324 and CVE-2008-2992). The embedded JavaScript is likely responsible for downloading and executing a second-stage payload from one of the identified external URLs. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6710

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)
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.china21.org2001%E5%B9%B410%E6%9C%881
    • http://www.jnmzzjj.gov.cn/ShowNews.asp?NewsID=107
    • http://www.china21.org
    • http://www.gmw.cn/01gmrb/2002-05/05/08-CA889495F7CED22848256BB00024F0E7.htm

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0006_000.js
7dbd4ca71288d48a355d779ed5a9d09e3b8fa6116796cf0e1b739655e16f0959		 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_off0002d361.bin
e524556deab6c2b762b1b5e7885197502f9d0423fb3ba80820975da60c6e1b38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2D361 180376 bytes
font_01_sfnt_off000322b7.bin
d1325ba38caa53995384480e422621db94cd2946ada08c272dc47f63c44b7a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x322B7 51588 bytes

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