Yesterday I received a group text message from a number I don't know and opened it by mistake. I was in a group chat with two other people, one in Pennsylvania one in Massachusetts. The message body was the phrase "knows what" and attached was a file called
voicenote.amr. The file was a 5 or so second clip of what sounded like paper rustling.
My question is what is the point of a spam text like that and what information could I have disclosed by accidentally opening it? I've gotten spam texts in the past but they are usually some sort of phishing.
EDIT: I am running Andriod version 4.4.4 and using the default texting app called "Messaging" it is also version 4.4.4. It handles both group and regular texts.