PDF malware analysis — malicious · 56e2bbb83a7107fa

MALICIOUS

PDF

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

MD5: a243626a775bf425b1ee99c9a10b45ea SHA-1: c32b35008f8725b5e3fea1a8ce40de2f02a5ffcc SHA-256: 56e2bbb83a7107fa58acf312391f563b2b7248b797c1d1274fe0e135d72209bb

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_FROMCHARCODE'. The presence of 'PDF_EVAL' and a high ML classification score strongly suggest that the JavaScript is used to execute arbitrary code. The embedded JavaScript file 'javascript_obj0001_000.js' is the primary artifact, likely responsible for downloading and executing a secondary payload. The authoring application 'String.fromCharCode' further points to obfuscated JavaScript execution.

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` `ef5b564c0835616c965c47170c510fec23d0a59b69a4a36764a110d4a30f80eb`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	868 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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