PDF malware analysis — malicious · dfb92e385ae41dbb

MALICIOUS

PDF

37.8 KB

MD5: e065515d925b982f2429cec17d53de74 SHA-1: 8b26c201c6684f60b92d64f34e33455ae58e5858 SHA-256: dfb92e385ae41dbb6191bf1496ac8751ee95c28853661671f2d8d39e56efa6ae

126 Risk Score

Malware Insights

MITRE ATT&CK

T1559.002 Component Object Model Hijacking T1059.007 JavaScript

The PDF contains embedded JavaScript and a RichMedia (Flash) object, both flagged as suspicious. The ML classifier strongly indicates maliciousness. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is likely responsible for executing the malicious content, potentially exploiting vulnerabilities in Flash or the PDF reader itself. The presence of an embedded SWF file further supports the delivery of a malicious Flash-based exploit or payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`Adobe.swf` `ce5f7936cf8e3536a88a804ce2d6902022df1794fa878bdc64a26866e34ba989`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xB05	55839 bytes
`javascript_obj0006_000.js` `bf64af147bf56d5bdf91e22c26ac16f296786e692a6cb5879b157eb5b4390686`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1654 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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