PDF malware analysis — malicious · 457518c21a5bdecb

MALICIOUS

PDF

37.7 KB

MD5: 2b7af6b5fdec4ff345e7af27225752b6 SHA-1: 0f274a4744f384fde8ae3bea8c283ba2927313c0 SHA-256: 457518c21a5bdecb8a8d93fc3c11a2a8c5ca6ac190239677c1175af6e1e7a305

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file exhibits multiple indicators of malicious intent, including embedded JavaScript and Flash content. The ML classifier strongly flags it as malicious. The presence of a JavaScript stream, potentially obfuscated, suggests an attempt to execute malicious code, likely for downloading further payloads or exploiting vulnerabilities. The embedded SWF file further supports a multi-stage attack vector.

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 0xAD7	55839 bytes
`javascript_obj0006_000.js` `7bcf00b193215e09f1e9fcab6e457c57013e5c4c279439f8617d7d4e4da35b48`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF5	1582 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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