PDF malware analysis — malicious · 71978b28cca5b97f

MALICIOUS

PDF

58.7 KB Created: 2006-02-16 15:03:51 -08:00 Authoring application: lice (via ubst)

MD5: 23c49914008f8feb4850299ef2432759 SHA-1: 1ad06622db1b2457742bf514d75f70629890369e SHA-256: 71978b28cca5b97f237aea400610bcf4d9c824e95ad5beccb4488adf644f7d54

106 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, flagged by multiple heuristics and a critical ClamAV detection (Pdf.Exploit.Dropped-94). The JavaScript is heavily obfuscated but appears to be designed to download and execute a secondary payload. The ML classifier also strongly indicates maliciousness. Given the nature of PDF exploits and embedded scripts, the most likely attack pattern is a spearphishing attachment leading to client execution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

ClamAV: Pdf.Exploit.Dropped-94 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-94
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_obj0076_000.js` `341e253bdc42f9a8ed25c75186c579eb10ca23d6f49b0555c87f37186cc34e12`	pdf-javascript-stream	PDF /JS object 76 at offset 0x955	50198 bytes

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