PDF malware analysis — malicious · 04e64a51c1a4db3d

MALICIOUS

PDF

8.1 KB

MD5: a14615120ed4748a5a40b3dc3ccfac76 SHA-1: 9327b429a3e20baf23183c4ade931f388a7548b1 SHA-256: 04e64a51c1a4db3d948004c1c2b8e78ee2cc11e4ca555476e2b3096016ab4105

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a JavaScript stream that is flagged as an exploit cluster. This JavaScript is likely responsible for executing a malicious payload. The ML classifier also strongly indicates maliciousness. No specific family could be identified, and no IOCs were directly extractable from the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9164

Heuristics 5

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off00000495.bin` `5bdb7a1d6cc913f16e928cff1cb85c3094dad965ee3adb9a296d87e7ec60f60f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x495	2420 bytes
`objstm_0025_00.bin` `36452e2080785e41acd7ed4a170f725557d83e047dfa2cbbadd2926a8b459f2f`	pdf-objstm-decoded	PDF /ObjStm 25 0 obj (inflated)	456 bytes

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