PDF malware analysis — malicious · 4f3eb144da645407

MALICIOUS

PDF

16.6 KB

MD5: a3474a025a229a189f21ecc4f9c80156 SHA-1: 26189ab01a08da1aab53076178a313c31f70095a SHA-256: 4f3eb144da645407769ab6d7a7172210068b7b361e0b93a6239c435e8a2d4547

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicating an attempt to obfuscate malicious code. The critical heuristic firing for CVE-2009-4324, specifically related to media.newPlayer and multi-marker percent-array decoded JavaScript, strongly suggests the exploitation of a known Adobe Reader vulnerability. The deobfuscated JavaScript likely attempts to download and execute a second-stage payload, 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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `78ffe8166fad4e173d5751ef0c7981a8d7ae5dc022954690588f108a78a99194`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3251 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111712_001.js` `78226235403cd7736c2598e3859b00841dc8c69f77d4d0f0f67df94afb9eea11`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE77	10685 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111713_002.js` `eb4c99e50834b1e0b0516839f56ec7c66fc631f9c504c196111b1bbb668021e0`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x386A	2450 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `9526a841366a560a33ecefc35d0a02acfd01ea4853436bfed8e7b6bd32831823`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xE77	1074 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `fa44c3a6a5df9dd0c4918db03b8a33dc1e24bba8204a13d66510a81c2b2e6f17`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x386A	166 bytes
`legacy_pdfkit_stage_002.js` `44001165c25b4a9ce41bcad2158e7c7fb95f2ed97ad52cdd09330338bf91492f`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xE77	1241 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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