PDF malware analysis — malicious · ee5b480a44a3a649

MALICIOUS

PDF

17.9 KB

MD5: 464e88436f2c094c67ecab23092a9ac7 SHA-1: ddd49e8ffc40fea3de074edc34ad34bfd5b2984b SHA-256: ee5b480a44a3a649b17beb382aa6e6f57580a566268ba7ba40014a37a05f0d82

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains obfuscated JavaScript, including multiple calls to eval() and unescape(), indicating an attempt to hide malicious code. The critical heuristic firing for CVE-2009-4324, specifically mentioning the media.newPlayer sink and percent-array decoding, strongly suggests exploitation of this vulnerability. The deobfuscated JavaScript artifacts confirm the presence of exploit code designed to download and execute a secondary payload. The reconstructed string literals like "v"+"ar "+"lWUldR4GAG"+" ="+" e"+"v"+"a"+"l;" and similar concatenations are used to construct JavaScript functions, further obscuring the malicious intent. The primary goal appears to be the execution of arbitrary code via the identified 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)
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` `0e893abf1566d45c63cabab131fb46cdbfcaceb40ef3170b8357a1fe31fb61cd`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3105 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` `3c225ed4b6dbcc2b99ff01c4fb8be90d447146334dfd155d78ddaee4645a9cba`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xDE5	12072 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` `15489179b2a4e5b2095eaf55c35a756fa369c89f9f4a62696145037724d246d5`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3D43	2579 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `e1870d54cc45e347aa1de92bf8215a50b2c632d0cec8e3fff4b1472c73c50a9b`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xDE5	1082 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` `96b2a5f7a22877fadb04e07bb4335bd122d4d8b085b2d24069d89aeba75753fb`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3D43	172 bytes
`legacy_pdfkit_stage_002.js` `606dd80b4f49ce4a45a7639fd65611ec91508ef61b5b7eaad59399815c57d377`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xDE5	1255 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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