PDF malware analysis — malicious · ca464d5e996add39

MALICIOUS

PDF

10.4 KB

MD5: e7fda9f957f681db8191c4682e28f227 SHA-1: 5c21239a7cddf9482538e4ba87556c0155269ce4 SHA-256: ca464d5e996add39f56ed04b8bd8d857fe34a79dcfd69585cb02d0acef84a845

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1105 Ingress Tool Transfer

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript stream, named 'javascript_obj0007_000.js', is obfuscated and likely responsible for downloading and executing a second-stage payload, a common technique for malware delivery. The unescape() function call further suggests obfuscation aimed at hiding malicious code.

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` `1d68cf9dc0578f4f1f04e6e53b2e58cfeb3199bdb9d61f002d0b7dc7df5a43b1`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	46627 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 224 eval/decoder/string-building token(s).

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