PDF malware analysis — malicious · efeb542940db66f7

MALICIOUS

PDF

37.8 KB

MD5: b25cec9047acb6300d42f83c78f8ffe9 SHA-1: 795052ba6cb983a2fcec975b664560c8c5664dac SHA-256: efeb542940db66f7303a63fbc19b2b729e3fd35afd48700a8371f19eaab013df

124 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a Flash (SWF) file, indicated by PDF_JAVASCRIPT, PDF_JS, and PDF_RICHMEDIA heuristics. The ML classifier strongly flags this as malicious. The embedded JavaScript, identified as 'javascript_obj0006_000.js', is likely responsible for executing the malicious payload or exploiting vulnerabilities within the PDF reader or Flash player. The presence of these embedded objects suggests an attempt to deliver a secondary payload or exploit.

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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