PDF malware analysis — malicious · 7547b0a7f7808676

MALICIOUS

PDF

6.6 KB Authoring application: Tisilarehaue (via 08d40Tibedegabala)

MD5: 67c44a14d2bc62203edb470cbc14c401 SHA-1: acbc607fc9ef0058fd638d5766b27992c8f1c0dc SHA-256: 7547b0a7f780867632cbecb462193723d7e46d02a8e850f378b3ff7fae385d98

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical heuristics PDF_OBFUSCATED_NAME_OBJECT and CLAMAV_DETECTION (Pdf.Exploit.Agent-36142) indicate the PDF contains obfuscated JavaScript designed to exploit a vulnerability. The embedded JavaScript attempts to decode and execute a payload, likely a downloader, based on its structure and the use of app.eval. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

Heuristics 4

Hex-obfuscated scripting name object critical PDF_OBFUSCATED_NAME_OBJECT

A PDF name object that drives script execution (/JavaScript or /JS) is written with #XX hex escapes to hide it from string-based scanners — e.g. /J#61v#61S#63r#69p#74 decoding to /JavaScript. Legitimate PDF producers always write these names literally; hex-encoding an executable name is a deliberate evasion used by exploit-kit and dropper PDFs.
ClamAV: Pdf.Exploit.Agent-36142 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36142
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.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0010_000.js` `d4dce4f95f7146e3b127d68edf45ceb045483a205d9e9a2a53d6e6b80d83b663`	pdf-javascript-stream	PDF /JS object 10 at offset 0x1230	1728 bytes

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