PDF malware analysis — malicious · 833f94ae15bbb7a1

MALICIOUS

PDF

85.9 KB

MD5: cb42296c2b1cda575bc34e5cd0c11aa7 SHA-1: 522d40dedee2a3e7ee6523422b2dfd0b58689968 SHA-256: 833f94ae15bbb7a1e0e4a8677a99aca6b87c135dd8cb457783912e5799fb3d31

136 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 JavaScript

The PDF sample contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The critical CVE_2009_4324 heuristic specifically points to the exploitation of a known vulnerability using media.newPlayer and JavaScript obfuscation. The deobfuscated JavaScript stream, legacy_pdfkit_stage_000.js, likely contains the malicious payload, although its exact function is not fully detailed in the provided evidence. The presence of these elements strongly suggests an attack pattern involving exploit delivery via a PDF.

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` `d4e2b3337a6ee10d4f0f566e16e3659ca3e344e17d921dbc157c832e44ed5d79`	pdf-javascript-stream	PDF /JS object 8 at offset 0x210	2966 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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