PDF malware analysis — malicious · f58b8cee27e133cf

MALICIOUS

PDF

186.4 KB

MD5: c9ec2ab10e62f19211c3e6fe6b730b3c SHA-1: 8f11ec2426fcfc9d6f0eab02e3f4be4a1f5985b7 SHA-256: f58b8cee27e133cf3bacb9648923337712cd479c6a03c270af863cb356bff463

166 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1059.007 JavaScript

The PDF sample contains embedded JavaScript that utilizes `eval()` and `unescape()` functions, indicating obfuscated code execution. The critical heuristic firing for CVE-2009-4324 (media.newPlayer) suggests exploitation of a known PDF vulnerability. The embedded JavaScript stream, named 'javascript_obj0008_000.js', likely contains the malicious payload. The reconstructed strings from `unescape` calls point to potential shellcode or exploit components.

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 1

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).

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