Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6e3127a678854a…

MALICIOUS

PDF

49.0 KB Created: 2009-12-16 23:15:23 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.1.2)
MD5: e3f121ba74da0681b181517a375d7de5 SHA-1: c4504a15d2c1fc5fecd699550c873e57ff651c1e SHA-256: 4f6e3127a678854a312dacccb33a7d3afab5c0bd911b38a140ca83de47837a0f
196 Risk Score

Malware Insights

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

The PDF file contains JavaScript that exploits CVE-2009-4324. This exploit is designed to download and execute a secondary payload. The presence of an embedded PDF within the main PDF, along with JavaScript obfuscation, further indicates malicious intent. The specific exploit trigger and the use of JavaScript point to a downloader or initial access technique.

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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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
stream_004_off0000063a.js
d4da7f0cc4c42486e1b0c04ccddc8d17dacc33ebe9194a2e301400d7aedc2576		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x63A 2578 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(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 0x63A 126 bytes
objstm_0023_00.bin
e8bfe65c34a535b0837ce7c541e45b42ab61e1ff13de05788daf7770f9a1ec0e		 pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 274 bytes
polyglot_child_pdf_off000091df.pdf
d960ead972ce47a236e33801a5b38882d16ac73c5b875fac7dc72b55dd1efc68		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x91DF 12790 bytes
polyglot_child_pdf_off0000abe8.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xABE8 6125 bytes

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