PDF malware analysis — malicious · 90561c0423b3b233

MALICIOUS

PDF

5.1 KB Authoring application: iText 2.1.7 by 1T3XT

MD5: e0b3d5a438f3bea713093e1f4a34fb7a SHA-1: f20dc9317af2605cc992deec3257ef560596c918 SHA-256: 90561c0423b3b2334340bbe87de987bf39367de56269c64b978e609459dfa3ec

130 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information T1204.002 Malicious File

The PDF file contains embedded JavaScript streams, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. High-severity heuristics like PDF_EVAL and PDF_UNESCAPE, along with the ML classifier's strong positive prediction, confirm malicious intent. The embedded JavaScript is obfuscated, as suggested by the EXTRACTED_FILE_STATIC_TRIAGE. The primary function of the obfuscated JavaScript is likely to download and execute a second-stage payload, a common technique for initial access.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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_obj0007_000.js` `fcfbc04c2b7ce9f8e6139877f05933d0efa521b79eb33b14dba75a5529692c5d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x15B	4336 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `2d54f79ccf2f86e3dd3e111b5e5f029c4506365ce8ddd90b352aaa78757ee29a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x17A	4810 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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