PDF malware analysis — malicious · 8c9e7b0f1f9960c6

MALICIOUS

PDF

85.3 KB Created: 2010-05-11 15:35:25 +08:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.0 (C++/Win32))

MD5: 0085f5d7c8cb8f8bde65e80f7383efb4 SHA-1: 93dd6d040c5f39d07ff68ac3dd18884ef5dd9b1c SHA-256: 8c9e7b0f1f9960c685d2bf5cf17a4960688ec2bc58f59455e91782df62bebcd6

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious Link T1071.001 Web Protocols

The PDF file contains embedded JavaScript that is obfuscated and utilizes the `unescape()` function, indicating malicious intent. The critical heuristic `CVE_2009_4324` specifically points to an exploit targeting this vulnerability, which involves JavaScript execution. The presence of a secondary embedded PDF further suggests a multi-stage attack. The primary goal appears to be the execution of arbitrary code via the exploited vulnerability, likely leading to the download of additional malware.

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.

Filename	Kind	Source	Size
`stream_004_off0000063a.js` `447cccb0b28690cfd35e6c7d285b83d1ca96a54fd0f2a437498ab8c6a303cc5d`	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
`font_00_sfnt_off0000ab1b.bin` `abf5a371cd7e8a64c39e8d39357d81ec822d1b898edb42bb7f7e38e1015f32ab`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAB1B	248108 bytes
`polyglot_child_pdf_off00009fd3.pdf` `a41bbb18934c7409de9ce0e60e995d1ed3c3e5f8f5bd98f66c9bfc7006f9975c`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x9FD3	46432 bytes
`polyglot_child_pdf_off00013d46.pdf` `0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x13D46	6125 bytes

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