PDF malware analysis — malicious · c859865ca49454c1

MALICIOUS

PDF

92.9 KB

MD5: 8dbb712cb5e7ee07691a7175b9ff641d SHA-1: d011a8227be684504c21fbffeb6ef01973ca565d SHA-256: c859865ca49454c1704aedf6af458915330bfab3ef64ceb6188f26b05dc25009

136 Risk Score

Malware Insights

The PDF file contains embedded JavaScript that is obfuscated and uses unescape() calls, indicating malicious intent. The critical heuristic firing for CVE-2009-4324 confirms the exploitation of a known vulnerability in Adobe Reader. The embedded JavaScript likely downloads and executes a second-stage payload, as suggested by the extracted artifact names and the nature of the exploit.

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` `3ec28b783b97560c0bc234ac94d2bed3320e38dc2be12525acd4ebc3d52750ef`	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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