PDF malware analysis — malicious · 57b4c8ca051e4421

MALICIOUS

PDF

10.9 KB Authoring application: .a

MD5: a6e6bbd8f9032ba11d4e17173369d037 SHA-1: a5bfeb2d53c335bcf22448dcfc38d3b654b491d3 SHA-256: 57b4c8ca051e442115ab7db23877625daf292692d33462a139bf9900715a2939

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript, named 'javascript_obj0018_000.js', is likely responsible for executing a malicious payload. The document body contains some readable text, but it does not provide clear context for the malicious activity. The presence of unescape() and String.fromCharCode calls suggests obfuscation within the JavaScript.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0018_000.js` `7f6b9a74d01bba5aadf92416a8f40bf17d598362de07d7fdc8f2603123480011`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	163415 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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