PDF malware analysis — malicious · 1fa176f9e236f362

MALICIOUS

PDF

10.4 KB

MD5: b2ab975a3dd5570ceba14815991fe593 SHA-1: 577eba428082c34bad4b39e3fad89f54bc98d1ef SHA-256: 1fa176f9e236f362b7980076310c44eaf2b884560813cc002410b3e52c68acf4

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics as malicious. The ML classifier assigned a very high probability of maliciousness. The JavaScript stream, named 'javascript_obj0007_000.js', is obfuscated and likely responsible for downloading and executing a secondary payload. The specific intent of the script could not be fully determined due to obfuscation, but its presence strongly suggests a malicious delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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_obj0007_000.js` `a51e932a5b83203b3782659146dae0bbb35dedea7b7a92333949eb99e3f5da4c`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	46949 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 226 eval/decoder/string-building token(s).

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