PDF malware analysis — malicious · e1b62f7032d666d1

MALICIOUS

PDF

12.3 KB

MD5: 39632d2486c03dd2b3384022a228e6ea SHA-1: b62101f6315fafcd1431c91d313b07e4c4224344 SHA-256: e1b62f7032d666d1051d63473e0e329b7005a944e9689771299c841402d6fd8b

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by multiple heuristics as a stager for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary technique involves leveraging PDF vulnerabilities to run JavaScript, which is likely used to download and execute a secondary payload, as suggested by the ClamAV detection name 'Pdf.Exploit.Dropped-94'.

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` `fc7b70155f32d84f1cc533ab581f6bd6b590b3663b4264756d58f4eb9168f779`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2F1D	331 bytes

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