PDF malware analysis — malicious · 4bf03dcd1d391a2d

MALICIOUS

PDF

23.1 KB Created: 2011-72-51 03:25:00

MD5: b0b88f6f5e0e2ef2864a30030909bfab SHA-1: 4bdaabda50754f6d490e2efead1c7d478a91eed9 SHA-256: 4bf03dcd1d391a2d061ede0c1a026e54a62b2215033d0b02554e904d5950a6ff

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Use of Legitimate Software: Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly indicates maliciousness. The JavaScript stream, named javascript_obj0001_000.js, likely contains obfuscated code designed to execute arbitrary commands, as suggested by the PDF_EVAL heuristic. This points to a common attack pattern of using malicious documents to deliver further stages of an attack.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
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` `58d335b65d8ca3ef2f4f2aa04d78cc33f19e09f2996190380282454ec6c7242f`	pdf-javascript-stream	PDF /JS object 1 at offset 0x58D6	677 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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