Bank statements, payslips, and e-Aadhaar PDFs
Banks, employers, and utilities often protect statements, payslips, and bills with a password made from your details, such as part of your name or your date of birth. The sender sets the format, so check the email that delivered the file. UIDAI protects e-Aadhaar PDFs with the first four letters of your name in capitals followed by your year of birth.