My opinion is that messengers like WhatsApp or other popular ones always have more vulnerability. Due to the fact that more hackers want to hack them. I think you need the caution relates to the transferred information. They all have their pros and cons. The main time to use your head. All no problem!

Interest there is at least try the app at work. Then it will be clear what to do with it. If everything is OK, you can save . Always test for a while. First glance, it may be a mistake.