PDF malware analysis — malicious · cf3a7c5fd8fb5dc8

MALICIOUS

PDF

10.9 KB Authoring application: Its base metals, but twixt either.

MD5: 037f23ac39ae071699c834625f0fb17b SHA-1: 1863085324380256c3c4cde8dac4ca68843df1e3 SHA-256: cf3a7c5fd8fb5dc8be91d6eba78a9f1e34711289db60871a735626b1102a1549

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_UNESCAPE. The ML classifier also flagged this PDF as malicious with a high probability. The embedded JavaScript, named 'javascript_obj0018_000.js', is likely responsible for executing malicious actions, such as downloading a second-stage payload or exploiting vulnerabilities. The document body contains seemingly random text, suggesting it's a lure or obfuscation.

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` `3d70abd0bf08aad43283a4d5a7619dee5323d6378132d67d1582a844ef48fff1`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	162867 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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