PDF malware analysis — malicious · b76e116a5dfa5fac

MALICIOUS

PDF

14.8 KB

MD5: 353294840492a7f6fa8dba89647389df SHA-1: d07c28e63349157ddca695b044f955de13bfb3c3 SHA-256: b76e116a5dfa5fac641271708660c8cad69c20bdc6bc6a0a1a30c4b2cc886059

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_UNESCAPE'. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript file, 'javascript_obj0006_000.js', is likely responsible for executing the malicious payload, potentially downloading and running further stages.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

Heuristics 5

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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_obj0006_000.js` `bc8e796163d508ecd8ae1ba0db96b0ef8a422783491ac669971e9fae7963eed7`	pdf-javascript-stream	PDF /JS object 6 at offset 0x197	15754 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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