PDF / .SWA malware analysis — malicious · 77457424c272166d

MALICIOUS

PDF / .SWA

7.2 KB Authoring application: Bofatezozinefaxfa (via 4f3e2Vogewojixariuawi)

MD5: d0ec483b64316f17d7b327c04d499e19 SHA-1: 74dd78bcac8942a0ebb36a6de3556d60206df5d4 SHA-256: 77457424c272166deb4c8a1b47985d5a658d2267c0b5d51e176c0e8cdaec1318

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 embedded JavaScript stream, 'javascript_obj0011_000.js', is likely responsible for executing the malicious payload. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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` `ca838ab153ea9de4fff1e74bdd0848fd720f71bc6fbee4425be234136cd19b41`	pdf-javascript-stream	PDF /JS object 11 at offset 0x1349	2325 bytes

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