I have searched here and found nothing.
A scan has declared 2 separate files to be decompression bombs: squashfs.img and squashfs. Both are unreachable with file manager: appear to be within Live .iso’s (fedora8 and gOS2).
SquashFS
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Squashfs (.sfs) is a free (GPL) compressed read-only file system for the Linux kernel. Squashfs compresses files, inodes and directories, and supports block sizes up to 1024 KB for greater compression.
Squashfs is intended for general read-only file system use, for archival use (i.e. in cases where a tar file may be used), and in constrained block device/memory systems (e.g. embedded systems) where low overhead is needed. The standard version of Squashfs uses gzip compression.
Hallo, compression bomb doesn’t mean “this is malware”. It says only that the compression ratio of the object is higher than some threshold, and that further decompression would lead to memory exhaustion.
Some time ago, older zlib-based squashfs was quite popular as compressed FS for live distributions. That’s why avast! might consider its parts worth of decompressing (gunzipping) and this warning is issued. It’s normal behavior :).