PDF malware analysis — malicious · b03febfd55178003

MALICIOUS

PDF

23.4 KB

MD5: 99b415566e4380dc2c95e74621ddcd32 SHA-1: a014f400cdbb9ede90db05a5287177dceea7d085 SHA-256: b03febfd551780036707ba1e0f309465aaf4eee22a4ebe23eecc90be9e87121d

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript that utilizes the CVE-2009-0927 vulnerability, specifically targeting the Collab.getIcon method. The JavaScript is heavily obfuscated but appears to be designed to download and execute a secondary payload. The ML classifier strongly indicates malicious intent. No specific family could be identified, but the attack pattern is consistent with exploit kit delivery mechanisms.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `7158829159f6cc65f4fede6c7249d84ab84f1059a14e4b00fb1137ebd4251f86`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3524 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` `8c4835765f1e893f20f391ec549cc455ea0f6a63126bb256405020cacbc54735`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xF88	18187 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` `2f64c33d3449aa31214ca6c4a6c2e69cba418de3961dacabb3494054de959ca0`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x56C9	1642 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` `5e9a3ebfae055a2d62a2cf8ce8117150345771dfe6004ed7d3771ec0c4ac3b47`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xF88	1529 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` `407624ceb11bdfcccd03817d5cc6229f3a3f8dfc15051e1567d07f2b81bcede8`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x56C9	100 bytes
`legacy_pdfkit_stage_002.js` `ef9e5b90375edff122881271c942288a32c8e05d098756b5fcc3ef32088e1055`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xF88	1630 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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