PDF malware analysis — malicious · 793c6a5099abeb93

MALICIOUS

PDF

37.7 KB

MD5: ae6a4076d93b628ba58d491ff9ae2abf SHA-1: 416bbeac895abeb597f985a1cef2dbbe82326982 SHA-256: 793c6a5099abeb93d9735158d6bc99bfbcc027b6ba34e9d5e97edc99bd4ed8d9

124 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model Hijacking: Component Object Model Hijacking T1204.002 Malicious File: Malicious File

The PDF contains embedded JavaScript and a RichMedia (Flash) object, strongly indicating a malicious intent. The ML classifier assigned a high probability of maliciousness. The embedded JavaScript, named 'javascript_obj0006_000.js', is likely responsible for executing the malicious payload, potentially exploiting vulnerabilities within the PDF reader or Flash player. The presence of these components suggests an attempt to compromise the user's system.

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 0xAC5	55839 bytes
`javascript_obj0006_000.js` `bce32915f9d1cee134d654cddcd3b65ba903a51ddf27994bea59ca7d4c6819d5`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1564 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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