Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d97658476b9bc0…

MALICIOUS

PDF

214.1 KB Created: 2010-06-29 10:30:35 +08:00 Authoring application: Acrobat PDFMaker 7.0.7 for Word (via Acrobat Distiller 7.0.5 (Windows))
MD5: 72b090cd55e9a427a0a5346c205dced3 SHA-1: d141def158fe0d0b3dc6172b654615e0a37959b2 SHA-256: b9d97658476b9bc0ddf6b13c499fb505f728af83a87272b5c6d2a49a67748155
244 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that utilizes the 'media.newPlayer' API, a known indicator for CVE-2009-4324. This exploit is used to execute arbitrary code. The presence of 'unescape()' calls and obfuscated streams further suggests malicious intent, likely to download and execute a secondary payload. The file also contains an embedded PDF, which itself has suspicious static findings.

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/
    • http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000392.bin
26971e5f40fc1cafd9cfdaf4f3e1a69603d066825d377316ebacaa3ef5b34401		 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_off00014d0a.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x14D0A 3144 bytes
font_00_sfnt_off0001a034.bin
9b1445a5a703621ac1b90bbe75e4c9229faeb092de10895275dc449920ea0805		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A034 223248 bytes
polyglot_child_pdf_off00013a9b.pdf
b7a40e4203c2a62008c2bd73e6bc065b5ec440257b178abde1793ee7d8196a02		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x13A9B 138719 bytes
polyglot_child_pdf_off0003408d.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3408D 6125 bytes

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