PDF malware analysis — malicious · 1f94e3307400d2a7

MALICIOUS

PDF

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

MD5: d8febcd7d22b92306f2c8806aeb8bdc1 SHA-1: 2ab9fd0c5408e4020157bf8ce029767ef05d35ff SHA-256: 1f94e3307400d2a7b212d5df375f8a444319db598554eef751d533e69886017e

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF sample contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly indicates maliciousness. The JavaScript stream, identified as javascript_obj0001_000.js, likely contains obfuscated code that uses eval() to execute commands. The presence of String.fromCharCode further suggests code construction and obfuscation. The primary intent appears to be the execution of arbitrary code, typical for a downloader or initial access stage.

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` `8da26359881c71c010e74b07158e51f53ff95d3ba10959d09137f27ff9bdce0e`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	879 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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