PDF malware analysis — malicious · 21d78c71d08d0449

MALICIOUS

PDF

7.1 KB Authoring application: Wezolokofecpo (via c3606Nworeticakebi)

MD5: 9f4a41b3a47f289b35fa502d65e475a1 SHA-1: cf092bd95c089f362b2c054af8a65601f3f64a9b SHA-256: 21d78c71d08d04499cd227cde2ee2bfc7017593b3152d6ae0ed1490e7f64d97f

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for obfuscated objects and an ML classifier indicating maliciousness. The presence of embedded JavaScript, identified as 'pdf-javascript-stream', strongly suggests an attempt to execute malicious code. This script is likely responsible for downloading and executing a second-stage payload, a common technique for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

Heuristics 3

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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_obj0011_000.js` `437a5d40b54247c17dfb3ac60e39d3ecfad672a269694af1851a077d9726a8d2`	pdf-javascript-stream	PDF /JS object 11 at offset 0x1342	2272 bytes

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