What file is raising MalformedInputException on slurp?

a.clj

;; What file is raising MalformedInputException on slurp? 

(use 'clojure.java.io)
(import 'java.nio.file.Files)
(import 'java.nio.file.Paths)
(import 'java.nio.charset.MalformedInputException)

(def directory? (memfn isDirectory))
(def name (memfn getName))

(def ->nbr #(Files/newBufferedReader (Paths/get (.toURI %))))
(defn malformed? [f] (try (slurp (->nbr f)) nil (catch MalformedInputException e f)))

(def files (file-seq (file ".")))
(transduce (comp 
	(filter directory?) 
	(filter (comp (partial re-seq #"resources|xyz") name))
	(mapcat file-seq) 
	(filter (comp not directory?))
    (filter malformed?))
conj 
files)