Fix
Avira is also known to cause issues downloading the game by blocking https://s3.amazonaws.com/, try another antivirus solution like malwarebytes
My antivirus detected adware in the latest snapshot. Could be a false positive but this issue should not occur either way. File was called jemalloc32.dll.
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is duplicated by 3
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Setting as confirmed, Avira and F-Secure are detecting as ADWARE/Elex.ihgri
jemalloc is a memory allocator (simple analogy: if you think of RAM as space on your desk, malloc determines where to put stuff on there and how to organize things as you no longer need them and there are different ways of doing this).
19w06a updated to LWJGL 3.2.1 (from 3.1.6). That update includes updating jemalloc from 5.0.1 to 5.1.0 (lwjgl 3.2.0) and then to the 5.2.0 pre-release (lwjgl 3.2.1). The specific version is commit 99f4eefb61ae1f13e47af6eac34748fd0a789404, according to the jemalloc32.dll.git file. Here's the changelog for jemalloc 5.1.0 and the changes from 5.1.0 to the version LWJGL is using.
My brief investigation into the DLL doesn't indicate anything suspicious (in particular anything that looks like adware), nor do I see any suspicious differences between the 32-bit and 64-bit versions (no scanner finds any issues with the 64-bit version). As such, I'm pretty sure that this is a false positive, though someone else who has more experience with the subject should probably confirm. Presumably, once jemalloc 5.2.0 fully releases and LWJGL updates to it (and Mojang updates LWJGL), this will be a non-issue.
Would not be the first time an Antivirus program got a little overzealous about stuff. The file in question looks to be a legitimate one needed in LWJGL