PDF malware analysis — malicious · ba67707cbb36b78d

MALICIOUS

PDF

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

MD5: dfb24351002d9d79cbe610b62ef6e767 SHA-1: 93a339832c79e73ef7bed91a2e3c7024ad1c5a43 SHA-256: ba67707cbb36b78d28968eea4bb133b6f6bc1be98cc5ac4ac3eb64895763f74d

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes String.fromCharCode and an eval() call, suggesting obfuscation and dynamic code execution. The ML classifier also flagged this PDF as malicious with high confidence. The primary intent appears to be downloading and executing a second-stage payload, as evidenced by the embedded JavaScript artifact.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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` `b5aa8107ab707c426410d6d893f05a20c8272f53036a29e64f63dbc1819fc7a8`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	911 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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