PDF malware analysis — malicious · f76e85504e767028

MALICIOUS

PDF

18.4 KB

MD5: 91f2f94c08ef48cc85f6b880198167e7 SHA-1: 76712aee62733620e79f8102f3730ffa552d6c23 SHA-256: f76e85504e7670280a5080bb26bb12afbb5cd785e51f6c0af67d6e912a39833f

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF sample contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The critical CVE_2009_4324 firing points to the exploitation of a known vulnerability in Adobe Reader. The embedded JavaScript uses eval() and unescape() functions, and string concatenation to hide its malicious intent, likely to download and execute a second-stage payload. The reconstructed JavaScript fragments suggest dynamic code execution and potential network communication.

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` `fd399a3d5cb54d54b2d5b3d470e51c5e7aecccb65b357998d5b4c0816f122f39`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3071 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).
`javascript_obj111712_001.js` `c987a83bc98bbb4f6f57779365d1d46a01fb03f148bc322cbe0834d7a501dff5`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xDC3	12601 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` `b97422a98a6b62212eb14dc987449248d8290a2cc8f5a89bd83c694c5f4b6391`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3F32	2578 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).
`legacy_pdfkit_stage_000.js` `6df5a6a2247c5da4259f0495fdbbf82b169223e476ecfae2c0ba3212ef1a3e53`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xDC3	1087 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 0x3F32	166 bytes
`legacy_pdfkit_stage_002.js` `ce4f908a66b538ac4023f7b6eca0b69d9fc89f1b409c9894e33fa43e313675aa`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xDC3	1254 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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