PDF malware analysis — malicious · 11e7f3728996c82b

MALICIOUS

PDF

3.2 KB

MD5: 33910f3a585bfadd1e935ca8468b65fe SHA-1: 60a9688cc60d9c865cfafd9c07032146ffc01dce SHA-256: 11e7f3728996c82b8fb7bfe6e58e42dbd241fbdb4940197d19a46b9735aae79d

268 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that leverages the CVE-2009-4324 vulnerability (media.newPlayer) to achieve code execution. The JavaScript code is heavily obfuscated using unescape() and string concatenation, indicating a malicious intent to download and execute a secondary payload. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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. (matched in decompressed stream)
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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
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_obj0006_000.js` `05dcf34aad1107265e21d674ade78a4354000a07eeb05e514ff886dd10a58ba9`	pdf-javascript-stream	PDF /JS object 6 at offset 0x191	2117 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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