PDF malware analysis — malicious · 9894edade7ef666f

MALICIOUS

PDF

13.9 KB

MD5: d454dccc133b4dcffb80e3a9b77311df SHA-1: 5586f3403bdf79a27f059b1debd9df380fabb606 SHA-256: 9894edade7ef666f2f5c87a8e1015e1e7cb86911ffdbd2fe567269e31c800fbf

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File Execution: Malicious JavaScript

This PDF file was flagged as malicious by a machine learning classifier and contains embedded JavaScript streams. Heuristics indicate the use of PDF-specific filters and JavaScript unescape functions, suggesting an attempt to obfuscate malicious code. The embedded JavaScript files, javascript_obj3332_000.js and javascript_obj3332_001.js, are likely responsible for executing the malicious payload, potentially downloading additional malware.

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 0x35EE	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 0x3620	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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