This appears to be a problem of Intego VirusScan, not MacOSX or Sage.
You may like to report the problem to them.

On Tue, Jan 1, 2019 at 6:04 AM Murray Eisenberg
<murrayeisenb...@gmail.com> wrote:
>
> I "solved" this issue finally by disabling my Intego VirusScan and then 
> opened the .dmg.app again. The verification process proceeded without 
> incident. Scanned the resulting .app with ClamXAV: seems OK. Was able then to 
> open the app and use it.
>
> But _something_ is odd about the .dmg's for this new version of Sage. The 
> interference with VirusScan (if that's actually what caused the problem) has 
> never occurred with earlier versions of Sage or with a host of other 
> downloaded .dmg's, including very large ones (e.g., Mathematica).
>
> On Monday, December 31, 2018 at 3:45:45 PM UTC-5, Murray Eisenberg wrote:
>>
>> After downloading sage-8.5-OSX-10.4.2-x86_64.app.dmg and checking md5 sum, 
>> when I try to open the .dmg, when it is completing the verification process, 
>> I get a macOS 10.14.2 crash - with kernel panic! I tried downloads from both 
>> UW and MIT, with same result.
>>
>> I've never seen this happen before, even when opening/verifying MUCH larger 
>> dmg's (e.g., for Mathematica).
>
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