PDF malware analysis — malicious · 73fda085a0f09109

MALICIOUS

PDF

12.5 KB

MD5: e5df7295eebeea88d6fb19ecedf6bcc9 SHA-1: 1ded361f503cf2f3ce843eb2ad05d875e495f2ed SHA-256: 73fda085a0f091098265e1984ca90d4bbf5266cb859e817dcd94c924b63600da

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that is obfuscated but appears to decode and evaluate a string. This script is likely responsible for downloading and executing a secondary payload, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics. The JavaScript's eval function is used to execute the decoded string, which is a common technique for dropper malware.

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` `924b85343e1093b109cffe2f5a23eb24aa2d4c9be8b396cb3c1e03a5e427f77c`	pdf-javascript-stream	PDF /JS object 76 at offset 0x2FED	331 bytes

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