PDF malware analysis — malicious · fb391c47b7a28928

MALICIOUS

PDF

14.1 KB

MD5: 22f52fe515c71e0b14e0b213d13446b1 SHA-1: 75a9067aea86efc8a9e70f252866cf82a7a7c705 SHA-256: fb391c47b7a28928297578b88ede1221a7f25df568868980163d6e3b3e371cb9

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flags this PDF as malicious. The JavaScript streams, named javascript_obj3332_000.js and javascript_obj3332_001.js, are likely responsible for executing obfuscated code, potentially exploiting vulnerabilities within the PDF reader. The presence of unescape() calls and ASCIIHexDecode/ASCII85Decode filters further suggests an attempt to de-obfuscate and execute malicious content.

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 0x3634	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 0x3666	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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