PDF malware analysis — malicious · 7fb48017a455f59d

MALICIOUS

PDF

12.9 KB

MD5: da0533e09af0db3f54a336198bbea60d SHA-1: cbe9ee60131ede4983c3fc38d91659e3ea83cad0 SHA-256: 7fb48017a455f59d36d35d3c3b76312c11f40c87fa4b1953327f37d20839c397

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 be designed to decode and execute a payload. The JavaScript uses string concatenation and eval to construct and run code, likely downloading a second-stage exploit or malware. The critical ClamAV detection and high heuristic firings confirm the malicious nature of the file.

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` `22e0a257b3d664e24c565bf8418e70a91cc3d269efc2060ad8267542894303cf`	pdf-javascript-stream	PDF /JS object 76 at offset 0x31A9	331 bytes

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