PDF malware analysis — malicious · e695b0b8ec03bb75

MALICIOUS

PDF

6.6 KB

MD5: cfd1f50ee93c9ba141f1b0374a139bf8 SHA-1: 30cbdd522c4d159163ce22b21f0289cf03644d4e SHA-256: e695b0b8ec03bb755208d0f033e1e6212d8eadee5c9c2c9a654310f9f1d8e11a

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1140 Deobfuscate/Decode Files or Information

Static analysis identified multiple indicators of malicious JavaScript within the PDF document, including the use of unescape() and ML classification flagging it as highly suspicious. The embedded JavaScript stream, named 'javascript_obj0009_000.js', is likely responsible for downloading and executing a secondary payload. The obfuscation suggests an attempt to evade detection.

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` `2c0b2b794651d0955e7d25d04959090e515fccf08c453dec5e447f891d5bd2fe`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD6	6007 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).

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