Malicious PDF — malware analysis report

Static analysis result for SHA-256 531748ac4e27bfc0…

MALICIOUS

PDF

96.0 KB Created: 2010-06-29 10:14:47 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)
MD5: c69780610e910ab5d4dc521fe0b9d7f8 SHA-1: a621a24b5721e1a608c49150e6ba3b249dec326d SHA-256: 531748ac4e27bfc0a0a2bb74adaa0b7fa97285dd10a5297128ba0413dc5c9537
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1566.002 Spearphishing via Service

The PDF file contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability, specifically targeting the media.newPlayer API. This JavaScript is obfuscated and likely responsible for downloading and executing a secondary payload. The presence of a polyglot child PDF further suggests a multi-stage attack. The primary attack vector appears to be exploiting a known vulnerability in PDF readers to achieve code execution.

Heuristics 7

  • 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)
  • 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.
  • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0021_000.js
81b2e72d3b99733864df19e027063acfc14cb5243a5bd085bde5a3691d06f8cc		 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_off00009327.bin
65299ef50d87d8647741d87f93816e418aa640c4de051f242b9eaea7ebff9716		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9327 94852 bytes
polyglot_child_pdf_off0000652e.pdf
63a05a901e955d819baa665a73431e9cc165f41655b5ac7526b270fed7dbcbe6		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x652E 72370 bytes
polyglot_child_pdf_off000167f3.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x167F3 6125 bytes

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