PDF malware analysis — malicious · 24c16a95db0ecac3

MALICIOUS

PDF

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

MD5: 20c1f81fc98140fff33d2130a5e98576 SHA-1: ba53f9810b1755cf3a6a925fc2bd8cd1f000544a SHA-256: 24c16a95db0ecac37fda42c997a1d16c4f3b637a2c34ef2c5f24ada59f1e6912

98 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 a high-confidence ML classifier (ML_NYX_PDF_MALICIOUS) and a PDF_EVAL heuristic firing strongly suggests the JavaScript is designed to execute arbitrary code. The extracted artifact 'javascript_obj0001_000.js' is likely the payload. The confidence is high due to the ML classifier and multiple JavaScript-related heuristics.

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` `1bcdcded31adaf361f0173522a144be16f644fd524088a62a799e3d3f9062e7b`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	930 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.