PDF malware analysis — malicious · b5561d4121908cb1

MALICIOUS

PDF

1.4 KB

MD5: a5ac16ce7eeaa7230ad5c0d929d59a07 SHA-1: e4a030500ef26c42e2af3e0bd518f4d4fe05aae5 SHA-256: b5561d4121908cb12af4d898bb9da3755d2b6306463ee788c8d8c846661448ac

118 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript that is obfuscated and utilizes the unescape() function. A critical heuristic firing indicates the exploitation of CVE-2009-4324 via the media.newPlayer object, which is a known vulnerability for arbitrary code execution. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload.

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` `80ac3c87ea36819908b28372f6e699f16f5988b600739329ab9494fb4afc2470`	pdf-javascript-stream	PDF /JS object 111111 at offset 0x160	1283 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`javascript_obj111112_001.js` `f38e4bc530a77b287830a50c9fa1ef4569ffd72f777e4bbb816794c286350e12`	pdf-javascript-stream	PDF /JS object 111112 at offset 0x488	266 bytes

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