PDF malware analysis — malicious · 118dc78610c9c728

MALICIOUS

PDF

12.6 KB

MD5: 9a143b99db9ddd6ca1e77c9fdc3b0622 SHA-1: 49e0da1824202a06156e55fd4ec162e356ba1a26 SHA-256: 118dc78610c9c72846e8ea52b29756934f93a23b9beb9cbb57c5193f6aca4961

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT' and 'PDF_JS'. The script decodes a string using a custom function and then evaluates it, likely to download and execute a second-stage payload. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics further confirm its malicious nature, with ClamAV specifically identifying it as '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` `34ea0f68458bb10a2acd211c0047674bb68a5fbc8e0b318dc1c8572497856cce`	pdf-javascript-stream	PDF /JS object 76 at offset 0x3047	331 bytes

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