PDF malware analysis — malicious · d93d382fb79d6e8d

MALICIOUS

PDF

18.5 KB

MD5: df06a63176732b06068edeacf1f3aa7e SHA-1: 0155876e6053d67e269c0a1d663f8c27adf55fec SHA-256: d93d382fb79d6e8d4578808e7f2cdb9d5e87932a9a8d360876739994b7424350

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains obfuscated JavaScript, including multiple eval() calls and string concatenations, which is indicative of exploit kit activity. The critical heuristic firing for CVE-2009-4324 specifically points to the exploitation of a known vulnerability in Adobe Reader. The embedded JavaScript is designed to download and execute a second-stage payload, as evidenced by the deobfuscated scripts and the ML classifier's high confidence score.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `2a3ddaf2a13842a1daf8d7b5fb2ec89681e306969f2837962ab02a409bbf03ee`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3270 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` `36c2d541cb1b361d0dfdcb14aa27b01ccfa6d91abbe3bc50c9754efefb4d5f3b`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE8A	12720 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` `0c9362a5a00e3389a8f32a4bf5500158438585af20e78ca9fe39c4abeaf3c355`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4070	2400 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` `14d9d23d619682a659b666d1537fbe47a8cc4db49b0c37d63714847d39b24a42`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xE8A	1080 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` `b588377e61afab2ec0162093e19dc04f67f83c5e7d671725e6a4c1e6b8285dc2`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4070	167 bytes
`legacy_pdfkit_stage_002.js` `5cec78869fc00dda5b351192647159bcef44f5a2ce7f7c5872f1244710f2c1c7`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xE8A	1248 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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