It came from my employer and contained pdf files detailing employee services. Pretty benign.
[30072.513509] usb 3-1: new full-speed USB device number 3 using xhci_hcd
[30072.646992] usb 3-1: New USB device found, idVendor=2016, idProduct=0917, bcdDevice= 0.00
[30072.646996] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[30072.646998] usb 3-1: Product: usb55
[30072.647000] usb 3-1: Manufacturer: udisk
[30072.647002] usb 3-1: SerialNumber: 11100042926
[30072.702584] usb-storage 3-1:1.0: USB Mass Storage device detected
[30072.703087] scsi host4: usb-storage 3-1:1.0
[30072.703194] usbcore: registered new interface driver usb-storage
[30072.705546] usbcore: registered new interface driver uas
[30073.837490] scsi 4:0:0:0: Direct-Access usb55 udisk 1.10 PQ: 0 ANSI: 2
[30073.838150] sd 4:0:0:0: Attached scsi generic sg2 type 0
[30073.838254] sd 4:0:0:0: [sdb] 8032 512-byte logical blocks: (4.11 MB/3.92 MiB)
[30073.838452] sd 4:0:0:0: [sdb] Write Protect is off
[30073.838456] sd 4:0:0:0: [sdb] Mode Sense: 0b 00 00 08
[30073.841219] sd 4:0:0:0: [sdb] No Caching mode page found
[30073.841226] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[30073.854419] sdb:
[30073.855432] sd 4:0:0:0: [sdb] Attached SCSI removable disk