PDF malware analysis — malicious · 3cc9345e588e5374

MALICIOUS

PDF

17.3 KB

MD5: ec21ddb08cd2e49d59f12643c5050a53 SHA-1: ef3b38bb1a77781a88298afc0e685980d621b1c3 SHA-256: 3cc9345e588e53746e3f9729054c85376ef8e6fa8724bdc2199e8dcadc8383a1

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains obfuscated JavaScript that utilizes eval() and unescape() functions, indicative of malicious intent. The critical CVE-2009-4324 heuristic firing confirms the exploitation of a known vulnerability in Adobe Reader via the media.newPlayer object. The embedded JavaScript streams, particularly the deobfuscated ones, suggest a multi-stage attack where the initial PDF serves as a dropper for further malicious code. The primary function appears to be downloading and executing a second-stage payload, though the exact URL is obfuscated within the script.

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` `7d4488f528c6a270c2f0c817e4a78144994901068bcf6ab70213c08b99d8a713`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	2832 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` `fda422276bba7c12a7bc40388e41f3dfa913a686049dbc215d1bd8e9e523cec0`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xCD4	11910 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` `a167af14047071f8e98ab5cb0bcebd687fe3427cf872f6498aea9dbd639f26d6`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x3B90	2433 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` `9526a841366a560a33ecefc35d0a02acfd01ea4853436bfed8e7b6bd32831823`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xCD4	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` `5091795dc7dfd1e269d30a5ab394f1536cab6157b0cb74b7e26a9fdc9129a46f`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x3B90	165 bytes
`legacy_pdfkit_stage_002.js` `0f172f68c70da175833c45a8201021f2a042b8d88f21777e79f2a05e33220881`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xCD4	1240 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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