PDF malware analysis — malicious · 70c52f5259508abc

MALICIOUS

PDF

11.9 KB

MD5: 0c79c93e97a2bdfcc827f5155a8aefc8 SHA-1: d63c065a1d4e10ca642191d3eee6c8fe7684e5a3 SHA-256: 70c52f5259508abc96429f15d2734ad125041ea335928ebd95bdb152cd298402

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT' and 'PDF_JS'. The JavaScript code appears to be obfuscated but is designed to decode and execute a payload. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent, with ClamAV specifically identifying it as 'Pdf.Exploit.Dropped-94'. The primary function of the script is to download and execute a second-stage payload, likely delivered via a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

ClamAV: Pdf.Exploit.Dropped-94 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-94
PDF metadata JavaScript eval stager high PDF_METADATA_EVAL_STAGER

PDF JavaScript reads document metadata fields such as title, subject, or producer, decodes character data with parseInt/String.fromCharCode style helpers, and evals the recovered stage. This is a high-signal exploit-kit staging pattern.
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` `6b52b5331c86392fffef3387f53513bc05cc0380403992ac18fdab70442d853a`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2D96	331 bytes

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