PDF malware analysis — malicious · fd84ab308edb25d1

MALICIOUS

PDF

14.0 KB

MD5: 231a387ddcd7c2c3578104ffad2d634a SHA-1: 331233ed9a296b2c1dd72b08a4b71a55f67efe41 SHA-256: fd84ab308edb25d13b2139c4cd1da3829fd40539e849200acc77f771650a423c

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple JavaScript streams and employs obfuscation techniques such as ASCIIHexDecode and ASCII85Decode filters, along with unescape() calls. The ML classifier strongly indicates maliciousness. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for initial compromise.

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` `6d2c5951088e55177160db39ffbef53ed408932dd18c020d523d599702d4adbb`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x3634	341 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj3332_001.js` `8474c2d6fe330f502ae8cc5973848dc2e27aafc19ff549e837267281e6e88ad4`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x3666	405 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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