PDF malware analysis — malicious · 830ac7c320a27632

MALICIOUS

PDF

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

MD5: 2901f019e9691afedca922f956d7dec2 SHA-1: 3d88ddb6429cd05c7d2b8a3a6904590736666a06 SHA-256: 830ac7c320a27632217e2585c164339c75873d63cc2a5231ef7b50a2f9d7b7a2

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_EVAL. The ML classifier also flagged this PDF as malicious with high confidence. The JavaScript stream, named javascript_obj0001_000.js, is likely responsible for executing the malicious payload. The use of String.fromCharCode and eval() suggests obfuscation to hide the true nature of the script's actions, which is typical for downloaders.

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` `c5e3b77d3379ca1be5ccba2cd8b7ec5503c80d13168042da851d45f32d88b981`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	889 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.