Malicious PDF — malware analysis report

Static analysis result for SHA-256 480db5c1884e76f5…

MALICIOUS

PDF

150.9 KB Created: 2010-06-29 10:14:47 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)
MD5: f6b50c59a17680906aea399c67382722 SHA-1: f613ec486fcad4e052311f1f0febbcb312bd3d59 SHA-256: 480db5c1884e76f523f43bdcb055d91b8b8a673d806bd900d7e65038d4abd195
136 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that is obfuscated and utilizes the unescape() function. Heuristics indicate exploitation of CVE-2009-4324 (media.newPlayer), a known vulnerability in Adobe Reader. The JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic firing.

Heuristics 6

  • 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. (identified after JavaScript deobfuscation)
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • Suspicious extracted artifact medium 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.
  • 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.
  • 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/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0021_000.js
763702855f717aa9b10bd28af70f5684a1d0a29a045550a12e1f6e39e522f573		 pdf-javascript-stream PDF /JS object 21 at offset 0x514 2371 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s). Carved artifact contains 1 long hex-escaped blob(s).
legacy_pdfkit_stage_000.js
42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74		 deobfuscated-js string-concatenation normalized Acrobat API aliases at offset 0x514 126 bytes
font_00_sfnt_off000080d5.bin
9161fe4440afa1ae3e8407dce1abb8b94f46f8ce58e6f9bf1d8f9891823f43f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D5 60696 bytes
font_01_sfnt_off00010131.bin
f6b53fda44c6463c5a0344b3ef90f0916928cfce19069bec8cf49c790afed189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 72556 bytes
font_02_sfnt_off000194cf.bin
f5ef29e4332f3cd319a38c8a52e634c761a739ab4f0338becd4ce85a08297ecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x194CF 62588 bytes
font_03_sfnt_off00021b56.bin
f36a023a5517222496e5870cea7f326d83e90b31d140d9b5cbf72d52f6d7d677		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21B56 40868 bytes

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