PDF malware analysis — malicious · ef4cf09c6d668204

MALICIOUS

PDF

31.6 KB

MD5: df8da5720d84c993d5e68c3393e7a1c4 SHA-1: ca4d29189d249e2426a93f506577ff5c19430838 SHA-256: ef4cf09c6d6682045b730be1a4512fc5b00750ed19585750e1794438671eac65

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript and a RichMedia (Flash) object, both flagged as high severity. The ML classifier strongly indicates maliciousness. The embedded artifacts include a SWF file and two JavaScript files, one of which is deobfuscated. These components likely work together to execute a malicious payload, potentially involving drive-by compromise or direct execution of a malicious file.

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 0x1350	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` `ba01799fe2ae0a2952a00c4e37e02f7d8c1888827e78f63d89b3088c0ed151e7`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF9	3847 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` `6c65dd0173ad46894d97b27964a4455524c0ccd1ac1a17a94cf15e72ea9744b2`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0xDB1	2475 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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