PDF malware analysis — malicious · ef466d69279e66b8

MALICIOUS

PDF

31.5 KB

MD5: db93a61c376f5cfa628ec940fada8695 SHA-1: 6e1877c196246e0950acb1506c128f8212007b93 SHA-256: ef466d69279e66b89c7597a6f2a11be3b18d42b3b5dba8e745ef698a987270fd

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF contains embedded JavaScript and a Flash object (SWF), both flagged as suspicious. The ML classifier strongly indicates malicious intent. The embedded JavaScript, specifically 'legacy_pdfkit_stage_000.js', appears to be responsible for executing malicious code, likely downloading and running a second-stage payload. The presence of these elements suggests a multi-stage attack leveraging PDF exploits.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`TyPWoIJRMY.swf` `767382813fc770c9716554c3266b22eee1636037ca964af05acf6ff66db4a27d`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x12FD	26993 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `b20824fc1da7a9610e28c0880ac490fd88a454f0cb86b5abd458745f090b0812`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF9	3764 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `ea7cd80a1b049e64065faffbed1e7deb409cf2f48c986128cf5d61d7df08434f`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0xDB1	2394 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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