PDF malware analysis — malicious · 6947c631d603d38e

MALICIOUS

PDF

1.7 KB

MD5: 8e02e4052484cca7eb21c6ec728ceb58 SHA-1: 18aea891710639580acdebaff530146e9e6cb2cf SHA-256: 6947c631d603d38e0a8e152e06ce8df8766e72a93a4f5e3da72e39ea1fc1f6ed

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample contains obfuscated JavaScript that utilizes unescape() and performs a heap spray. This is indicative of an exploit attempting to gain code execution within the PDF viewer. The script's intent is to prepare the heap for exploitation, likely to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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_obj0005_000.js` `ea777a6cf3738c15e13ffb5d63ed849ef1165d764876f4d01e8c2a51c2cbce4e`	pdf-javascript-stream	PDF /JS object 5 at offset 0x10A	1221 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `9ba6fac24411a4938816b9c83ddfefd190369f8a58f943d37209a6e7612849a0`	pdf-javascript-stream	PDF /JS object 5 at offset 0x10A	638 bytes

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