PDF malware analysis — malicious · e68f38195b3c8163

MALICIOUS

PDF

208.4 KB Created: 2011-10-23 16:56:29 +08:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.3 (C++/Win32))

MD5: c0d5b1cc0c77fcf32ff02aac98fac536 SHA-1: 2154845e38fc348ae1be419684f9572a680fabfd SHA-256: e68f38195b3c816309882388c23118327ec97f9ad775bf59b9a8a3089dd68fd8

206 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicating obfuscation and potential malicious code execution. A critical heuristic firing for CVE-2009-4324 (media.newPlayer) suggests exploitation of this vulnerability. The embedded JavaScript likely downloads and executes a second-stage payload, as suggested by the 'javascript_obj0008_000.js' artifact and the presence of a secondary embedded PDF with suspicious findings.

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
Secondary embedded PDF body has suspicious static findings high 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.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.
Suspicious extracted artifact info 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.

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `7a97ac86ccb25ded0688173ad61f89612239618e9cf53c5bbb1ef7f97d96cb3e`	pdf-javascript-stream	PDF /JS object 8 at offset 0x58F	1296 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s).
`font_00_sfnt_off00022d0d.bin` `58cd32f90289d6d99182bc154b48ec5fc8ab8830295dac6319b70a7174d9666f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x22D0D	245432 bytes
`font_01_sfnt_off00031bd0.bin` `2c696dc6d3f774b032c20b6df3f8bf7b37c115b21dcfcc077a270ccdd5b65082`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x31BD0	22232 bytes
`polyglot_child_pdf_off00021681.pdf` `d20dfebed28cdf25e04bbbd7343945973f6d55f02e067e4f1f3cdf13c9e02df4`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x21681	76521 bytes

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