PDF malware analysis — malicious · aa0d671c43dfcfb6

MALICIOUS

PDF

16.5 KB

MD5: c5c9b7d2b3b9c2d9b15ddcd3ee0c96e7 SHA-1: 2caffbf7ae269c152817cdbf0cbd492549ed547e SHA-256: aa0d671c43dfcfb62a4095fca7f1757cfddb30c85802d2e47c52d9b4606c2e97

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains heavily obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and a critical CVE_2009_4324 alert. The obfuscated JavaScript utilizes eval() and unescape() functions, and string concatenation to hide its true functionality. The primary intent appears to be the execution of a second-stage payload, as suggested by the CVE-2009-4324 exploit trigger and the presence of multiple embedded JavaScript streams. The reconstructed JavaScript code indicates the use of eval() and unescape() to dynamically generate and execute code, a common technique for downloading and running further malicious content.

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` `eb45208040308f60ecb927d30a9427ab35a5f6735b8c8d6a8c1b6775c4645278`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3014 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` `ad23651d711c252cf030e9fb164bba04ea1e303e03b4c60bca3fbd2e7c144b2b`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xD8A	11098 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` `44bd5cf6449634a66d58d6aefead9395e54fdf8e27c06d7983c372b329b912af`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x391A	2179 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` `b388424d64593e7d7790033ecf09ccadfed607b9966eb0edc5cf504edee09446`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xD8A	1085 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` `b973fca447f6cf3918d7563ec7286e964bd050d5006184130f727c28230bb4f6`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x391A	168 bytes
`legacy_pdfkit_stage_002.js` `11d439a5b58082b5150031acb9ffde507f541dcc1f47d6e5071e5daa00b54f54`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xD8A	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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