PDF malware analysis — malicious · 4648737ac0268792

MALICIOUS

PDF

146.9 KB Created: 2011-04-13 15:00:33 +08:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.3 (C++/Win32))

MD5: cbea315f41205b731379521c5464c134 SHA-1: 8ead9704fb5d8c9522986e155fa645a055c0fc97 SHA-256: 4648737ac0268792fb609b9915cee0e160aef699654b2093e09fea59f45ff3ca

166 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 dynamic code execution. A critical heuristic firing for CVE-2009-4324 (media.newPlayer) suggests exploitation of a known PDF viewer vulnerability. The embedded JavaScript, named 'javascript_obj0008_000.js', likely serves to download and execute a secondary payload, contributing to the malicious nature of the document.

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.
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
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 2

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_off00021c89.bin` `9deb1b9f8d540749c7f959968d185dc976dc5754180de3407fbd6b0343327cc1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x21C89	25632 bytes

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