Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9bf1fdeaad0b41…

MALICIOUS

PDF

182.9 KB Created: 2010-06-29 10:30:35 +08:00 Authoring application: Converting...
MD5: ec65341899f5a7a7990a7d3c3d3b9a85 SHA-1: 49007b3372ac62f04a92eb388cbd20061cd79ca5 SHA-256: dd9bf1fdeaad0b417290759fb478da6e4aef216f6dc0daa6393faebd8739272f
244 Risk Score

Malware Insights

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

The PDF exploits CVE-2009-4324 using embedded JavaScript. The heuristic 'CVE_2009_4324: media.newPlayer' indicates a direct exploit of this vulnerability. The embedded JavaScript, identified as 'legacy_pdfkit_stage_000.js', is obfuscated but likely responsible for downloading and executing a secondary payload, as suggested by the 'PDF_JAVASCRIPT' and 'PDF_EMBEDDED' firings. The presence of a polyglot child PDF further suggests a multi-stage attack.

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/

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000392.bin
5d3d48366e40e57822fad81f35cd66c4db7669881bfb299b7ff03d2a15d93411		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x392 4147 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_off000284fe.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x284FE 3144 bytes
font_00_sfnt_off00016487.bin
d9ae0c9e3a0009327c6d27848c7ad14a14f5c23e890ef7c3cac52e64fa37318f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16487 20368 bytes
font_01_sfnt_off000196fb.bin
e626cd9575d011ea3fcbece22d304e78e0c2c9097cc61223e52b587d73207e74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x196FB 235524 bytes
font_02_sfnt_off00021674.bin
8dcc379017fa1b751cea2ba3e048430d6727180eed122b5797ee91e32bbea9db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21674 237144 bytes
polyglot_child_pdf_off0001369b.pdf
dfb32d194ac3ba4f58726593e7b317a35c9a62c415bfe9ea6dfed124414a369d		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1369B 107770 bytes
polyglot_child_pdf_off0002c3a8.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x2C3A8 6125 bytes

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