PDF malware analysis — malicious · b9016e2421ec117b

MALICIOUS

PDF

23.1 KB

MD5: e533411dc9d35659a285bfc045b60afe SHA-1: a888d046335e9486c206a51a4dc327eb27a2290b SHA-256: b9016e2421ec117b44eb46b65319055ed5f7e7389b95865dddbc5416c9dca6cd

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols T1204.002 Malicious File

The PDF contains obfuscated JavaScript that utilizes eval() and unescape() functions, indicative of exploit code. The heuristic CVE_2009_0927 specifically points to the Collab.getIcon vulnerability, which is used to trigger the execution of this JavaScript. The embedded JavaScript streams and deobfuscated stages suggest a multi-stage attack designed to download and execute a secondary payload, likely for further system compromise.

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` `f5bc0ed358f3b766ffc28992a66bece8b7dbe5accb41c1e0787c75ccd7cf244f`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3495 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` `5571d06bbfebc866edefd9a3641b5899ae5cd70bb9ec5dc5139b77f237f5f5fc`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xF6B	17886 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_obj111713_002.js` `d874e25ee480819d18d2eddbd2aa20bf1410958f887fee955199135884d8a09f`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x557F	1669 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` `1412a09b263e0a64c28cc7f184247102cbe88e4b5ed6b84ed0c0c83087aaa08b`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xF6B	1521 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 0x557F	99 bytes
`legacy_pdfkit_stage_002.js` `304d67ac207b77af4308fc097efd95ccd42eb93a9afaa0a93566636fc003e284`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xF6B	1621 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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