PDF malware analysis — malicious · 8a3daca0f97bda2c

MALICIOUS

PDF

37.3 KB Authoring application: PyPDF2

MD5: fc85df17a1af033323f98a225cbdc989 SHA-1: ef216c124edc07a8d9573953000ad906ac66a0d3 SHA-256: 8a3daca0f97bda2c9e1ead73c1ac88ee13d839c86c3a99da5bccdc99191d0724

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains multiple embedded JavaScript streams, identified by PDF_JAVASCRIPT and PDF_JS heuristics. High-severity firings for PDF_EVAL and PDF_UNESCAPE indicate that the JavaScript is heavily obfuscated using techniques like `eval()` and `unescape()`. The ML classifier also flagged this PDF as malicious with high confidence. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the obfuscation and the nature of the extracted artifacts.

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
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `359f9e7fa4297681b7179f036f48a63ad8bf44e3cfe3d4eec93ff3cbe16f313d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x2BA	24859 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 10 long hex-escaped blob(s).
`javascript_obj0007_001.js` `9dba0a197c7f17439d1865ec3395e2109b6b5720cd3400cc1f219d4de6e7e4de`	pdf-javascript-stream	PDF /JS object 7 at offset 0x2BA	13645 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).

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