PDF malware analysis — malicious · f9726c393a6b98c1

MALICIOUS

PDF

550 B

MD5: b6a5de0505704894b0c8cf57eee56e13 SHA-1: db1cb422b4423efa94ed5188038ab40e35aacbcd SHA-256: f9726c393a6b98c10b2a2ca312fb93dbe47bf33716ea791ac03d4614ccfc882c

166 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV with the signature Js.Exploit.HTML-28, indicating it contains malicious JavaScript. The embedded JavaScript stream is likely responsible for exploiting a vulnerability within the PDF reader to execute arbitrary code. This is further supported by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristic firings.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

ClamAV: Js.Exploit.HTML-28 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Js.Exploit.HTML-28
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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_obj0009_000.js` `0740bfaa23c628e06d0d34cd9f1091df62c12aa0bbd1bcac35532a1dd63feac9`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD6	382 bytes
Detection ClamAV: Js.Exploit.HTML-28 Obfuscation or payload: unlikely

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