PDF malware analysis — malicious · a026883ff75d190e

MALICIOUS

PDF

4.0 KB

MD5: db4dbb2e8776248737e8202c43506383 SHA-1: 8e9e97fff480afcbd9c1252cc6c3de243a5f6c92 SHA-256: a026883ff75d190ef0bd4cf9433a37be24f044d78507d1f359073ffc2e143bd7

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly indicates maliciousness. The JavaScript appears obfuscated, making its exact function difficult to determine, but the presence of eval() and String.fromCharCode() suggests dynamic code execution. The primary intent seems to be downloading and executing a second-stage payload, though the specific mechanism is obscured.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `63332bbeb2f9b35ff3ba07e0a272449d17a1d18c261dc674c3cb1b726262d96d`	pdf-javascript-stream	PDF /JS object 9 at offset 0x1EC	2610 bytes
`javascript_obj0010_001.js` `856bb141e3177baa25367ab4ff132d08f59329d0cc1854a7bba8741a5ffa348e`	pdf-javascript-stream	PDF /JS object 10 at offset 0xC56	545 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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