These files are rarely the result of a single "hack." Instead, they are often "combolists" —aggregations of data stolen from various older website breaches, phishing campaigns, or malware infections (stealer logs).
You can check if your email has been compromised in this or similar leaks by using the Have I Been Pwned database. 35K EmailPASS.txt
Immediately update the passwords for any accounts that used the credentials found in such lists. Use a Password Manager to generate unique, complex strings for every site. These files are rarely the result of a single "hack
It is a structured text file, typically formatted as email:password or username:password . Use a Password Manager to generate unique, complex
Turn on Multi-Factor Authentication (MFA) on all sensitive accounts. This ensures that even if a hacker has your "EmailPASS" combo, they cannot gain access without a secondary code.