PDF malware analysis — malicious · 55e9b5e02808fe03

MALICIOUS

PDF

1.1 KB

MD5: 351604e5983a8ae67841995503f78ec0 SHA-1: 1ebb9d5c76b673aca9603841a7f6a38659d979a1 SHA-256: 55e9b5e02808fe03529cd002d998c83f6b6c17a6f6a4b1e31c0328bb60a79abb

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

This PDF file contains embedded JavaScript, flagged by multiple heuristics including ML classification. The JavaScript utilizes an unescape function with a long string of Unicode characters, indicating obfuscation. The primary intent appears to be the execution of malicious JavaScript, likely to download and run a secondary payload. The specific payload and delivery mechanism are not fully discernible due to obfuscation, but the presence of JavaScript actions and streams points to a common PDF-based malware delivery technique.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `3fb5cab084bb2c6ab661b742153d601f12ea54621242d90868c1e7484000c37d`	pdf-javascript-stream	PDF /JS object 6 at offset 0x134	384 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0006_001.js` `df0ac43c8047965803b6f961d7215cca852fe33a13d73974dcdff157c7cf42aa`	pdf-javascript-stream	PDF /JS object 6 at offset 0x154	753 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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