PDF malware analysis — malicious · 85989b8bee885be8

MALICIOUS

PDF

7.5 KB Authoring application: Jgaxivakafowizasi (via c4682Uohosicilab)

MD5: ed4b5fe2c53e2cbddace1db97823de05 SHA-1: 7617f4c4128f672b1de678b158c80eb0d41183b8 SHA-256: 85989b8bee885be8788ef854c5b95f1a3c69022cf6a2f38a4be9333959382399

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_OBFUSCATED_NAME_OBJECT' and 'PDF_JAVASCRIPT'. The ML classifier also flagged the PDF with high confidence. The embedded JavaScript is designed to execute malicious code, likely to download and run a second-stage payload, which is a common tactic for malware distribution via spearphishing attachments.

Machine Learning

Nyx PDF Classifier malicious score 0.9954

Heuristics 4

Hex-obfuscated scripting name object critical PDF_OBFUSCATED_NAME_OBJECT

A PDF name object that drives script execution (/JavaScript or /JS) is written with #XX hex escapes to hide it from string-based scanners — e.g. /J#61v#61S#63r#69p#74 decoding to /JavaScript. Legitimate PDF producers always write these names literally; hex-encoding an executable name is a deliberate evasion used by exploit-kit and dropper PDFs.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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_obj0011_000.js` `c35f939b8b08b4458e4f2307d4bfd0afc23546c955e11c1da88e87302e40c9b0`	pdf-javascript-stream	PDF /JS object 11 at offset 0x1358	3029 bytes

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