PDF malware analysis — malicious · d8bab83419f6fd61

MALICIOUS

PDF

131.3 KB Created: 2008-10-29 09:36:06 +08:00 Authoring application: xyghPDF SDK 4.3 (via BCL easyPDF 4.30 (0615))

MD5: 2ac243b6052980592ab670b9bb4ec847 SHA-1: 0a6cd5d9f0a856d23091aa51df60b518e48d046e SHA-256: d8bab83419f6fd61e301beee14ca977d57667d9c3adfa200ae6bed6ba3190f74

196 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF sample contains embedded JavaScript and triggers the CVE-2009-4324 vulnerability, indicating an attempt to exploit PDF reader software. The presence of JavaScript actions and unescape calls, along with a secondary embedded PDF, suggests a multi-stage attack. The primary goal appears to be the execution of malicious code via the identified exploit.

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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off00000329.js` `07366e0d11ea2d380093c6549e4fcbdadab1a0df22cf234853e0bf2c4a75a70c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x329	2684 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 0x329	126 bytes
`objstm_0024_00.bin` `5e33c5e97bbc41469ea4328ae48aa20389a4ed5a4c9608e42a4e56b7bc98859c`	pdf-objstm-decoded	PDF /ObjStm 24 0 obj (inflated)	332 bytes
`polyglot_child_pdf_off0001f1f5.pdf` `4044524e0d63e7a8080f48c5c2ac2d90f174bca6a94b7529f245da6d43f70bcf`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x1F1F5	6976 bytes
`polyglot_child_pdf_off0001f548.pdf` `0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x1F548	6125 bytes

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