PDF malware analysis — malicious · 2ad49a587248ab7f

MALICIOUS

PDF

2.7 KB

MD5: c75b84f70c0b6735cbb097b6adb63e97 SHA-1: 2f7efd97a7f72af32eb3629928c4ecfa100ea230 SHA-256: 2ad49a587248ab7fc68ee29551f49b994d4b04fc4391fb4c44567aaf67e29f75

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'PDF_EVAL' and 'PDF_FROMCHARCODE' rules suggest that the JavaScript is obfuscated and likely uses dynamic code execution. The ML classifier also strongly flagged this PDF as malicious. The primary function appears to be executing obfuscated JavaScript, which is commonly used to download and execute further stages of malware. No specific family could be identified due to the obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
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
`javascript_obj111711_000.js` `5a2e17cac763980740b49748845f7b28dce9ccd3a538c00bf9e77f57cf893e82`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2504 bytes
`javascript_obj111712_001.js` `4012a41a14fac5f7ec99e2f53c6a5c31757029ff3284670237d1ac3b0aa9ea5f`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x8BB	523 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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