PDF malware analysis — malicious · 843f05a10843bf3b

MALICIOUS

PDF

865.5 KB Created: 2010-03-24 21:13:32 +08:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.3 (C++/Win32))

MD5: 6db883bfe5d07e29bdded1b909cdbb9e SHA-1: 4223a98ef4e61b8055e5e458884c2e3a8aa29d27 SHA-256: 843f05a10843bf3b840c7b22d9365c2746f086b3dc036322b7dea41ce0a9c565

234 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript and triggers heuristics related to PDF JavaScript exploits, specifically CVE-2009-4324. ClamAV also detected it as Pdf.Exploit.Agent-19518. The presence of JavaScript and exploit indicators strongly suggests the document is designed to execute arbitrary code, likely for downloading and running a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9930

Heuristics 6

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.
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Exploit.Agent-19518 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-19518
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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00001979.bin` `5cca1658f14363177a7fd7b9e8d0b4a449aeff87d9e292d0379f20846d91f75f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1979	268208 bytes
`font_01_sfnt_off00013941.bin` `2fc915bab6ce024427c19bff0c7434578e3c808dd961d5451a5da5a83399d697`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13941	22984 bytes
`font_02_sfnt_off000161ef.bin` `a69cc8fb1ee97ad91e253e88a9d688bbec3b33ba074931089bce8771bc3e5cce`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x161EF	25320 bytes

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