PDF malware analysis — malicious · cdb9fd9ddbd9cbd8

MALICIOUS

PDF

132.2 KB Created: 2010-06-29 10:14:47 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)

MD5: 6227e1594775773a182e1b631db5f6bb SHA-1: 0516830c85217ea190179dc889646388392855e6 SHA-256: cdb9fd9ddbd9cbd8496747a70ae6708d1805a3e684857d5008da46f49cb83170

256 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that is obfuscated and utilizes the unescape() function. Critical heuristics indicate exploitation of CVE-2009-4324 via the media.newPlayer API, a known method for executing arbitrary code. The presence of a secondary embedded PDF and a detected ClamAV signature (Pdf.Exploit.Agent-30114) further confirm malicious intent. The script's likely purpose is to download and execute a second-stage payload.

Heuristics 8

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.
ClamAV: Pdf.Exploit.Agent-30114 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-30114
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.
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.
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.

Filename	Kind	Source	Size
`javascript_obj0021_000.js` `2712258c4ba31b2592f040a0af97a0ddcfb496bfc6aecc438a9eb648d9e1b8b8`	pdf-javascript-stream	PDF /JS object 21 at offset 0x514	2371 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 2 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 0x514	126 bytes
`font_00_sfnt_off00015bb7.bin` `c2f20d2c0ee280eaee809e56ae8baeb75faa06df5401c71f77d56e786c85f663`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15BB7	63548 bytes
`font_01_sfnt_off0001d953.bin` `b16803b7d114cb12fb266b60575cd0a9e818df7b0e99c895a750405ebaccf3da`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1D953	11616 bytes
`polyglot_child_pdf_off00006502.pdf` `44a4ea06a314fb880d9ada42ede4c4af1bd4711fc89c07d41dd4868417fc5078`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x6502	109473 bytes
`polyglot_child_pdf_off0001f8b6.pdf` `0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x1F8B6	6125 bytes

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