PDF malware analysis — malicious · 683a134ddb428115

MALICIOUS

PDF

3.2 KB

MD5: 525acba1d0970996dca3371e2fa5e923 SHA-1: b3cd07c2893baa66aa7a5241ef517ef63d04b549 SHA-256: 683a134ddb42811509e9e82a3b684c9c3bd233d411dc31834c187b30c04f99be

206 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that utilizes an unescape function, a common technique for obfuscating malicious code. The script appears to be designed to execute a payload, as indicated by the ML classifier and ClamAV detection. The JavaScript attempts to call a function using a string constructed from an array, which likely leads to the execution of a second-stage exploit or downloader.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
ClamAV: Pdf.Exploit.Agent-36121 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36121
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `e81dbb4f26aa5d24989fbac07273551013dbeee5020ed7ce5d22faeab7b3e6dd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C2	483 bytes

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