PDF malware analysis — malicious · 171c5e83639c3b6e

MALICIOUS

PDF

8.8 KB

MD5: 52a6e365e8af5e455f2311708ff32b7a SHA-1: 1766653290b4ee39e7d670ada8355287d4a60d77 SHA-256: 171c5e83639c3b6e37c65ac5c5328b6fce43d642059ce6ae235d5b3d7a90c47d

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The presence of 'PDF_EVAL' and 'PDF_JS_EXPLOIT_CLUSTER' strongly suggests the JavaScript is malicious and intended to exploit a vulnerability for client execution. While no specific URLs were found to be malicious, the JavaScript stream itself is the primary indicator of compromise, likely serving as a downloader for further malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.7056

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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)
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_002_off00000329.bin` `f13f9c3ca65b1cc9d3aabac3556a04c1ec22f89b4b744ab21a79c44c11abc1e3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x329	4373 bytes
`objstm_0024_00.bin` `30c4d7a05600b749a3cdaf487dd8caa5ddffd9386effc5b5758a437761dd86d1`	pdf-objstm-decoded	PDF /ObjStm 24 0 obj (inflated)	388 bytes

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