No. It is a legitimate cache folder generated by Vita3K. Some antivirus software may flag it erroneously due to heuristic analysis of binary code – submit it as a false positive.
Find and select the work.bin file that came with your game dump. : vita3k workbin file
These files are usually generated on a hacked Vita using the NoNpDrm plugin when a legitimate game is launched. 📥 How to Use Work.bin with Vita3K vita3k workbin file
Place the work.bin file inside the zip at the following path: TITLE_ID/sce_sys/package/work.bin . Install this zip via in Vita3K. Where to Find work.bin Files vita3k workbin file