PDF malware analysis — malicious · 5b6eba26dcf6663d

MALICIOUS

PDF

12.6 KB

MD5: 763d1674ad57429a6fa0770aa40a212b SHA-1: 564a3c67cdff63762741cb1f22d09d9be9baaf5e SHA-256: 5b6eba26dcf6663d2186a455e3678d1377b42a6a0aaebadac7297c8f4d85dfc7

146 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 that attempts to decode and execute a payload. The script uses string concatenation and array lookups to obfuscate its actions, but the overall intent appears to be downloading and executing a second-stage payload, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics. The specific ClamAV detection name 'Pdf.Exploit.Dropped-94' suggests a known exploit pattern.

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` `c0164aba9844146ce126e5eba5880a3b9237d51e4f4b407a1b2e0c3e816c2cfe`	pdf-javascript-stream	PDF /JS object 76 at offset 0x3061	331 bytes

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