PDF malware analysis — malicious · a151873854795d3d

MALICIOUS

PDF

17.2 KB

MD5: 0031e84b5b3162e7c8c9d2cb8f9626e9 SHA-1: caa260a38403218f450f94dc5c37b87ac50ac6c6 SHA-256: a151873854795d3de3df38712d7576fc1d7a2e826fe5a583fd5fd274a31ce0e9

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and a critical CVE_2009_4324 alert. The embedded JavaScript uses eval() and unescape() functions, along with string concatenation, to hide its malicious intent. The primary purpose appears to be exploiting the CVE-2009-4324 vulnerability in Adobe Reader to download and execute a secondary payload. The deobfuscated JavaScript streams confirm the use of these techniques.

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` `ce16295ccd8d7d1a7c30e788fcfa2d446adca3eeb7af89d5a7e172030e041485`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3455 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_obj111712_001.js` `e6f641a50c279c1ec273b4d36284e79f05b79be6fa60149ead8430b01972770c`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xF43	11091 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_obj111713_002.js` `aaaa8fcf1ade922c6b535a969250d5a85f616a97604abd719b6cd4fa16d91e9e`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3ACC	2466 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` `3cece914b914841a8b17f6d40f0553e78ef8ed60e76aa68605abeae7e560099e`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xF43	1081 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` `5e44e976706a9ab7e5b8d535683c4fffccb507242d738446636eccdb95bdd1dc`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3ACC	171 bytes
`legacy_pdfkit_stage_002.js` `d0141655f34e58e3da0087dc5086be8f74261cf72a9085bf2b9130da292841b9`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xF43	1253 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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