Adobe doc suffix

• Common email attachment format
• Extension on many e-mail attachments
• Email attachment, often
• Printable crossword, perhaps
• Adobe filename extension
• Suffix for some email attachments
• Attachment, often
• Digital doc format
• Electronic document format

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
by 1992, initialism (acronym) for portable document format , a generic term.