PDF malware analysis — malicious · e143890873d9a866

MALICIOUS

PDF

6.7 KB

MD5: d34f00d4a0b60a17aa8bf508e030f421 SHA-1: 1b7790bd878c5eeca5e0a7828f4d0fd7a292d827 SHA-256: e143890873d9a8664534230b2f66f4ba345b19a0862d3609d47aa735aa9cd2f8

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged by a machine learning classifier as malicious and contains embedded JavaScript. The JavaScript stream is obfuscated and utilizes an unescape function, indicating an attempt to hide malicious code. The primary function of the script appears to be downloading and executing a secondary payload, as suggested by the ML classifier and the presence of obfuscated JavaScript. No specific family could be identified.

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_obj0009_000.js` `ee4b742cee2fcf13dcfcf5254a1a3118b9688a6a68ec8cf7d8ac0448f08523ae`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD6	5887 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).

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