PDF malware analysis — malicious · 9fbb375895d02314

MALICIOUS

PDF

45.8 KB

MD5: 163d5202e79e3884ac10a430cc936548 SHA-1: b33711d0bec7e2a4749c9fc48abc2def4738eecf SHA-256: 9fbb375895d0231455fe29c1916fb993835a1160e0a45a5a86aa8e5f31240d45

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.001 Malicious Link: Malicious Link T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF file contains embedded JavaScript that leverages the CVE-2009-0927 vulnerability, specifically targeting the Collab.getIcon function. The JavaScript is obfuscated and decoded through multiple layers, ultimately executing an exploit stage designed to compromise the user's system. This indicates a downloader or dropper functionality aiming to deliver a secondary payload.

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)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `721cae9ec6b700e648cfa3c886dd10dac592779e7e9ef430cacd710f50011e4f`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1D3	9215 bytes
`custom_b64_stage_000.js` `8215e3e0b6a86d21b492f7d2005919f43de0699b39cd3b7c432fead0fbfb7e2e`	deobfuscated-js	custom Base64 decoded JavaScript layer 2 (PDF /JS object 8) at offset 0x8A7	1517 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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