PDF malware analysis — malicious · 4a3ef84e4c1b861b

MALICIOUS

PDF

2.5 KB

MD5: e1e8d434f60f55109452ba4b35c2b4b2 SHA-1: 0b8baa258e25863a47b87a344782b4a48f5bfc14 SHA-256: 4a3ef84e4c1b861b457f5189ffed8f3b72b72600a11e024e9db8d3d7ead3da48

106 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF contains embedded JavaScript and RichMedia (Flash) content, indicated by the PDF_JAVASCRIPT, PDF_JS, and PDF_RICHMEDIA heuristics. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript file, 'javascript_obj0006_000.js', is likely responsible for executing the exploit or delivering a secondary payload. The document body contains repeated references to '20101297.swf', suggesting this is the name of the embedded Flash 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
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
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `a23bda4dad2deae8461565d85ba5203065082b792a0dfe8e4025ebae0bf0ec37`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF6	9286 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 199 eval/decoder/string-building token(s).

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