PDF malware analysis — malicious · e8fbe1fbf2f531ce

MALICIOUS

PDF

58.3 KB Authoring application: Biropidmaxeli

MD5: f94eccf224539791c07fd083443e992b SHA-1: a73c92c37ed6cc64788dfc98fca30badc058cef2 SHA-256: e8fbe1fbf2f531cea5a68b3faa745fa787745a2290cd8bb52d6aa11a748595de

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, flagged by multiple heuristics as suspicious and malicious. The ML classifier assigned a high probability of maliciousness. The JavaScript stream, named 'javascript_obj0069_000.js', is heavily obfuscated, suggesting an attempt to hide its true functionality. The primary intent appears to be downloading and executing a second-stage payload, though the exact URL or execution method could not be definitively determined due to obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 0.9879

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_obj0069_000.js` `d87c88eb7d8e945bc88474f6839fc4ea5e3fe8ae1c0baaac3023a9cf22f72efa`	pdf-javascript-stream	PDF /JS object 69 at offset 0x61D1	32216 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 22 long base64-like blob(s).

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