PDF malware analysis — malicious · 3472bcc7ad45d2cb

MALICIOUS

PDF

37.7 KB

MD5: 2ff812859801b626c199c5505d87f316 SHA-1: a46e848adf6bb1211f286ee889e4b4b3e0168409 SHA-256: 3472bcc7ad45d2cb9fc3f3b81d24acb2b05a917d95827989183fe681993c5bef

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1559.002 Component Object Model Hijacking T1204.002 Malicious File

The PDF contains embedded JavaScript and a Flash object, indicated by the PDF_JAVASCRIPT, PDF_JS, and PDF_RICHMEDIA heuristics. The ML classifier strongly suggests malicious intent. The embedded JavaScript file, 'javascript_obj0006_000.js', is likely responsible for executing the malicious payload, potentially exploiting vulnerabilities within the PDF reader or delivering further malware. The presence of String.fromCharCode and ASCIIHexDecode filters further supports the obfuscation and exploitation attempts.

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 0xAC9	55839 bytes
`javascript_obj0006_000.js` `3d3e9bd060912d4166f99f76a75a7d77a0e7b94ab4ab80506305896587a3bbbf`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1588 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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