PDF malware analysis — malicious · a3f9a9dbf0422c8d

MALICIOUS

PDF

1.4 KB

MD5: 3446836312d9cbf7c6e5b342927491a8 SHA-1: 5f27e3927ac93df493a175f0f3200579f5cb9fd0 SHA-256: a3f9a9dbf0422c8d00e0ed966020fb7492fe198ddbd428907683fe07b5fd91a2

118 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File T1071.001 Web Protocols: Web Protocols

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. A critical heuristic identified the CVE-2009-4324 vulnerability related to media.newPlayer, suggesting the JavaScript is used to exploit this flaw. The JavaScript stream was further obfuscated using unescape(), a common technique to hide malicious code. The primary intent appears to be downloading and executing a second-stage payload, as suggested by the 'Suspicious extracted artifact' heuristic. No specific family could be identified.

Heuristics 5

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)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111111_000.js` `b781f206a1d6714b0ca5f2e562b706392c9ebaa058ee0e2368633df733463403`	pdf-javascript-stream	PDF /JS object 111111 at offset 0x160	1203 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`javascript_obj111112_001.js` `95f478561a2f5defdf626d7e60b750feec383bf011dcb79e325e72710a596f5a`	pdf-javascript-stream	PDF /JS object 111112 at offset 0x46C	253 bytes

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