PDF malware analysis — malicious · e0ecdeb36a4b65c7

MALICIOUS

PDF

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

MD5: 9e526a37f4ba2b3107282d57db75e2d1 SHA-1: 63cc910a75eea1ebd55c951cfdd57ece13ea38f5 SHA-256: e0ecdeb36a4b65c7f08e8f9779bf9a0c645b08ef5b93d5e0df8223853226cc10

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious File

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_FROMCHARCODE'. The presence of a high-severity 'PDF_EVAL' rule firing suggests the JavaScript is being used to execute arbitrary code. The ML classifier also strongly flagged this PDF as malicious. The embedded JavaScript file, 'javascript_obj0001_000.js', is the primary artifact, likely responsible for downloading and executing a second-stage 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` `e5ee87867677e23c06e3166b8fc6331c69df3f31b01115a8626362ac045e9006`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	856 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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