PDF malware analysis — malicious · 0e4741791c65789e

MALICIOUS

PDF

1.5 KB

MD5: 68fa395a220e59f85874fd6e0f394034 SHA-1: bb604a0bc6beb353cb701c9b41b77d3b28f90b62 SHA-256: 0e4741791c65789efd0b261fe4ecf15bcfbc5a1338e040f6fe2bd1bdd682a713

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that utilizes the unescape function, a common indicator of obfuscation for malicious scripts. The script appears to be designed to download and execute a second-stage payload from a URL, as suggested by the heuristic firings related to PDF JavaScript exploits and the ML classifier. The reconstructed URL from the script is http://www.example.com/evil.exe.

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 (matched inside decoded stream)
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_obj111111_000.js` `41b91939e7aa4d712d83333ff659b52dcb787aa64140425f86ef9650042edf1c`	pdf-javascript-stream	PDF /JS object 111111 at offset 0x160	2281 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 base64-like blob(s).
`javascript_obj111112_001.js` `71ca6770f3455cef80efa3bd35c869eedcc30d59a5bfd17bfb76da5e57f3683c`	pdf-javascript-stream	PDF /JS object 111112 at offset 0x571	65 bytes

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