PDF malware analysis — malicious · 2816058ca3803407

MALICIOUS

PDF

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

MD5: ebd2b02f32e02c221b65fcbeb0ce3b8e SHA-1: b17b79e2a14d99cdf9b6990e38f235e63b875f5b SHA-256: 2816058ca3803407f9a01e2c67c977f4d1fcad9febe0fe498334c4e6aeb9ac79

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also flagged the PDF as malicious with high confidence. The presence of `String.fromCharCode` and `eval()` within the JavaScript suggests obfuscation and dynamic code execution. While the specific payload is not directly visible, the typical use of such embedded scripts in PDFs is to download and execute further malicious content. No specific family could be identified.

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` `a214f0da2e714709c0b9888e997939aa29b7d5e2a09f25d6ac3f92a2b601cea1`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	1009 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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