Malicious PDF — malware analysis report

Static analysis result for SHA-256 301d8dc588f8e50e…

MALICIOUS

PDF

90.3 KB Created: 2010-04-16 14:22:58 -04:00 Authoring application: PScript5.dll Version 5.2.2 (via Acrobat Distiller 8.1.0 (Windows))
MD5: be8a4164a5904961719d37faaaaefa81 SHA-1: 985ee244d908bc4f19bb7c774edaa6fac1810402 SHA-256: 301d8dc588f8e50ee58077f7d85c167afa95f68fde109845bace8b3731f391fe
196 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that is obfuscated and utilizes the unescape() function, indicating malicious intent. Critical heuristics identify CVE-2009-4324 as a trigger, suggesting the exploit is designed to execute arbitrary code. The presence of multiple embedded PDF files and JavaScript streams further supports the conclusion that this document is a dropper or exploit loader. The primary JavaScript stream, stream_004_off0000063a.js, is likely responsible for downloading and executing a second-stage payload.

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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000063a.js
1a1267cc32bc1f0228be0507a53cd94ef48950b039a24ccc4111fba80021c6b7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x63A 2610 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
icc_00_off00010cac.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x10CAC 3144 bytes
polyglot_child_pdf_off0000eddb.pdf
ae90a43743643f7219f2675d86173df0a88b1cd889f487df2a9e5c44bf212230		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xEDDB 31617 bytes
polyglot_child_pdf_off0001516f.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1516F 6125 bytes

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