PDF malware analysis — malicious · 24ee8f02d102e008

MALICIOUS

PDF

104.4 KB

MD5: df3df46c515d64fd420368f785a457f0 SHA-1: 2c9a1befd33e7658a85fe9d8a827e514430be9f7 SHA-256: 24ee8f02d102e008f1a8a06e4d8f3e119e51374745538167622569a86208c7ff

136 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded JavaScript that is obfuscated and utilizes the unescape() function, indicating malicious intent. The critical heuristic firing for CVE_2009_4324 points to the exploitation of a specific vulnerability in Adobe Reader via the media.newPlayer API. The deobfuscated JavaScript stream, legacy_pdfkit_stage_000.js, likely contains the code to download and execute a secondary payload, which is a common technique for initial access.

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. (identified after JavaScript deobfuscation)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `ad4c2028ecde17be0ca667a1b23ccb50d87eadc7fb008f6483bf427a27d32e78`	pdf-javascript-stream	PDF /JS object 8 at offset 0x210	2960 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 3 long hex-escaped blob(s).
`legacy_pdfkit_stage_000.js` `42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74`	deobfuscated-js	string-concatenation normalized Acrobat API aliases at offset 0x210	126 bytes

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