Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8179ead0be0a792…

MALICIOUS

PDF

250.3 KB Created: 2010-06-29 10:30:35 +08:00 Authoring application: Acrobat PDFMaker 8.0 for Word (via Acrobat Distiller 8.0.0 (Windows))
MD5: 41210896ce7fe7fb0649d64c10b29a9c SHA-1: 806b318304556ee6c7e4ffc2592cede0cc72bf8a SHA-256: e8179ead0be0a792b8564a31a089591540fa024d91bdc231ae7bd7f84d365520
244 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a RichMedia (Flash) object, indicating an attempt to exploit vulnerabilities. Specifically, the CVE-2009-4324 heuristic firing points to the use of the media.newPlayer API to trigger an exploit. The presence of an embedded secondary PDF and obfuscated JavaScript further supports this. The attack pattern is likely to leverage this exploit to download and execute a second-stage payload.

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. (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.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • 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 file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (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/
    • http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000392.bin
4a5557f55eb12df6d6fef2d325b6e506a36073ef09475e823f5790ab0797bf42		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x392 4264 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 3 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 0x392 126 bytes
objstm_0017_00.bin
dd7918c182d6e2b8d996a6b8ee81663c49a0cb297efe1e1fa3c5af0c987bde84		 pdf-objstm-decoded PDF /ObjStm 17 0 obj (inflated) 871 bytes
icc_00_off0002db72.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x2DB72 3144 bytes
font_00_sfnt_off00028ed0.bin
0e0517f6b1057ff2c505822f00109a0b51bb3a23d2be2444217a93527d0e9b03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x28ED0 167032 bytes
polyglot_child_pdf_off0001f097.pdf
5565eaaba69b8d04f799478fd3ab326fa6a7212f64cd4ac65b53fa0e18959584		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1F097 129178 bytes
polyglot_child_pdf_off0003d144.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3D144 6125 bytes

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