PDF malware analysis — malicious · f78381286996a395

MALICIOUS

PDF

22.3 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: dbb6e320653dc5f68bbfc0a944f0b9da SHA-1: e15043294bc51c36ad456b17737cf76d3cf28cd0 SHA-256: f78381286996a3958edb1578dce853b27cc04062b7d1310def244887c9df7145

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a high-confidence PDF_EVAL heuristic firing suggests the use of eval() to execute obfuscated JavaScript. The ML classifier also strongly flagged this PDF as malicious. While no specific URLs or further script details were extracted, the pattern indicates a downloader or dropper functionality, likely using eval() to deobfuscate and execute a malicious payload.

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.
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_obj0001_000.js` `59d3a31efa6b25296848a97637e14b2d2442c00825597c1bb3bb82fb4b62f3f3`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	525 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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