Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ce21d6507f3fda…

MALICIOUS

PDF

153.0 KB Created: 2010-06-29 10:30:35 +08:00 Authoring application: PScript5.dll Version 5.2.2 (via GPL Ghostscript 8.15)
MD5: 12031052858edc8e9a7a1b5d8ca85f51 SHA-1: 719ab7a764f579e75b401d0a16627d5578c61455 SHA-256: 79ce21d6507f3fda2348ab32e028ae8a3e4cc7aa34242fba467a11e0e4b72ad1
244 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits CVE-2009-4324, a known vulnerability in Adobe Reader related to media player handling. The heuristic firings indicate the use of JavaScript actions and unescape() calls, common in exploit kits. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, although the specific URL or payload could not be reconstructed from the provided evidence. 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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000392.bin
bfa340cc3663a4ba03d49ff0dc334871f64d97cc1058beedb9030205473fa095		 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).
stream_011_off00022676.bin
26af9a104d71730866baa367d3ee2057d6b03df15f340b81dd9d3ebd574ab19f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x22676 2903 bytes
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
font_01_cff_off000230e2.bin
b12fb34baf12050254b771e1c032b63a3f72143e1e23b7608f80b70fdd9811ec		 pdf-font-stream PDF embedded font (cff) at offset 0x230E2 5170 bytes
polyglot_child_pdf_off0001e693.pdf
fe0f2a192f6a6ca89051d65f381e621f8a0216941f34e041b89419b12aca5257		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1E693 32086 bytes
polyglot_child_pdf_off00024bfc.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x24BFC 6125 bytes

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