PDF malware analysis — malicious · 8b1b6c0c89ed65ae

MALICIOUS

PDF

14.1 KB

MD5: 29ee0403d148d337f53154d0b4c69745 SHA-1: 8ef21998abf990d0b67a9497f890e69c3071b6ac SHA-256: 8b1b6c0c89ed65aef1c235c36048010dc935cc2d9d02c9a5c9c01583123046f0

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF contains embedded JavaScript streams, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_UNESCAPE and PDF_FILTER_HEX/85 filters suggests obfuscation and potential exploit delivery. The ML classifier strongly flags this PDF as malicious. No document body text was available for analysis, but the embedded scripts are likely responsible for executing a malicious payload, possibly involving obfuscated JavaScript that attempts to exploit vulnerabilities within the PDF reader.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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_obj3332_000.js` `061e28b62cdc637cabf56946c59276168de5732fcc2d403de36726087e689301`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x3638	469 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj3332_001.js` `13fb6af34b1b1c1a0155eb3cc4f5c2670151646b1c4be5f70b12ec773685509b`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x366A	533 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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