PDF malware analysis — malicious · a1597dac31f0abf8

MALICIOUS

PDF

23.8 KB

MD5: 2812e3a482e0b760da67266673b014ad SHA-1: af8881b14f2a01acc550d05d3cd65cf78c1da9c2 SHA-256: a1597dac31f0abf80dc56d9e24d187cc3648a7f1a0a8d99b4de1557267df78e4

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains obfuscated JavaScript that leverages the CVE-2009-0927 vulnerability through the Collab.getIcon method. The JavaScript uses eval() and unescape() functions, indicating an attempt to hide malicious code. The deobfuscated scripts suggest the primary goal is to download and execute a secondary payload. The presence of multiple embedded JavaScript streams and deobfuscated stages points to a multi-stage attack. The specific exploit used is CVE-2009-0927.

Heuristics 5

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (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` `6bb9ce5dfbb0562b2e5fd1e78d60ebd6def16019b1abd4289e8a940a170a5be9`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	3258 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_obj111712_001.js` `33b4379d8d9f003ba6e97a7dfa64aa84b77261b70385f10e9eeae080cf2d016e`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE8C	18920 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` `2ea93760d76b26f4b033c8e0f16eba566e5b08a2fe2f57e977b6313357d0866e`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x58AE	1602 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` `66f4f2a0b5975fe3532a29b5b346cfde109a773bcb04969f08f6d1db5b7bd63b`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xE8C	1536 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `1397a77c63e5e8be02a059fd3c671fb708b92cb64d00ded4f2045e71093dec16`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x58AE	99 bytes
`legacy_pdfkit_stage_002.js` `76a21fbd83e1876a56f056d8598e96d27f3eeff7c8e6d19f4e3dd6b5e22911e9`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xE8C	1636 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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