Auto Adobe Updater wants to install a new version of itself. Doesn't say what Adobe product it relates to. All I have on this laptop are the freebies - Reader, Flash, etc. I don't know if there is one updater, or many, one for each product. I've generally trusted these popups, so I said "yes". I then searched Drive C for "Adobe" and found nothing newer than March 3rd. My version of Updater is still 5. Nothing else happened, but while investigating online, I found a "critical" update to Reader was announced last month, and I didn't have it yet. So I manually got Reader 8.2.1, then later installed 9.3.1 instead. Called Adobe to see if such Updater updates are being distributed, and they said "We don't support free software, go to the forums." So, even though my version is still 5, updater never updated me for a critical update, and I have no new files, can I trust this popup wasn't for the distribution of malware? Anyone else getting this popup?
If you have set Adobe Reader to receive automatic updates, then it is that Updater (5 or 6) that pops up that way. Unfortunately it doesn't tell you what update it is about to download; only after the download it tells you what it is installing.
However, your caution is well-founded; you don't know if this is a legitimate process, or some sort of malware.
Assuming that you are on Windows, open the Task Manager and check if it is really the Adobe Updater that is running (AdobeUpdater.exe or AdobeUpdaterInstallMgr.exe).
Why not just uninstall your version 5 and then downlad and install the lastest version of Adobe Reader. It is time-consuming to update from verison 5 to lastest version. Actually I hate frequently update from adobe.