PDF malware analysis — malicious · e113c5c1c2a6ef57

MALICIOUS

PDF

230.1 KB Created: 2010-06-29 10:30:35 +08:00 Authoring application: Acrobat PDFMaker 8.0 for Word (via Acrobat Distiller 8.0.0 (Windows))

MD5: 2ff40d161aa5e7c9fafbdf08b89a54f1 SHA-1: 4f087ce5be80e6a7f939ea803d376186be7bc1c2 SHA-256: e113c5c1c2a6ef579271c523a9966e0fb085626314e6bfb05f81573c18acfeda

244 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded JavaScript and a Flash object, which are used to exploit CVE-2009-4324. This vulnerability allows for the execution of arbitrary code, likely to download and execute a second-stage payload. The presence of multiple embedded PDF objects and suspicious static findings further supports this attack vector. No specific malware family could be identified.

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/

Extracted artifacts 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off00000392.bin` `7bef1c339731828f158199a964baadf6f85d161250bebcebc423a038cf1bd474`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x392	4070 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_off0002d606.icc` `2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e`	pdf-icc-profile	PDF ICC profile at offset 0x2D606	3144 bytes
`font_00_sfnt_off00029039.bin` `9d8a883558d6f0374c9b354a05260cd2a4e34fd8c4659c08d7572de6dc6c2b40`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x29039	179780 bytes
`font_01_sfnt_off0002ef02.bin` `eb0c4be71ed5117805d89feb2d13ae4150a30ddc5437d69a9b67b52a484a32e0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2EF02	167032 bytes
`polyglot_child_pdf_off0001f097.pdf` `a416ec5f03f296cb69c02f2a75ce1ff677b460056c81479bf7f9ea522555fbe9`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x1F097	108541 bytes
`polyglot_child_pdf_off000380a7.pdf` `0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x380A7	6125 bytes

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