PDF malware analysis — malicious · 49e97e7aa7c084fd

MALICIOUS

PDF

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

MD5: e1ef5d61ada277339031abd0a78cd381 SHA-1: 14927c7d5d974ec303d3149284efe1ea43fb382d SHA-256: 49e97e7aa7c084fd27cf1b6c82c6cd1be3b2562830e3520c4a6ffbdd1b1f7822

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also flagged this PDF as malicious with a high score. The embedded JavaScript, named 'javascript_obj0001_000.js', is likely responsible for executing malicious actions, potentially downloading and running a second-stage payload. The use of String.fromCharCode and eval() suggests obfuscation techniques were employed to hide the script's true functionality.

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` `b089f5c2f55189bb89f0c1fa3da118d96249f5ebd1ee1285280aa8dd1a4bfbe3`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	523 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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