PDF malware analysis — malicious · be83db9b01222f24

MALICIOUS

PDF

10.7 KB

MD5: 06775d2465329782e57369af9a290808 SHA-1: 2b3fffa90dcb5feb12a389740979973a13d4a8a4 SHA-256: be83db9b01222f24ef320c85695e79a7d1596872f9a3e35a14c45c7a2b07dd63

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flags this PDF as malicious. The unescape() function is used, suggesting obfuscation within the JavaScript. The primary attack vector appears to be the execution of this embedded JavaScript, which likely downloads and executes a second-stage payload. The file 'javascript_obj0007_000.js' was extracted and is suspicious.

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` `81d61d260d1df63206f290f79c215f95e81fdb1cf1ccd927312cdf7faa2953c2`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	47459 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 250 eval/decoder/string-building token(s).

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