PDF malware analysis — malicious · 18edf701b5e1dc1c

MALICIOUS

PDF

3.2 KB

MD5: d690ec963b4294c8bb4c93ed62743d78 SHA-1: ae03d78aae1cb325c8a376b1e97f80b3aff2b98c SHA-256: 18edf701b5e1dc1c6ec5c171f629f074de0c09d2987de65a4abdd64a7f284e4a

206 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript that utilizes the unescape function, a common indicator of exploit activity. The script appears to decode a string from the PDF's title field and then execute it. This behavior strongly suggests the sample is designed to exploit a vulnerability to achieve code execution, likely for downloading and running a secondary payload. The ClamAV detection further supports its malicious nature.

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` `ac0ee2a23a5be22eafc28fff29c63f7ae3023f6cea2b209275c833e62c3a4a1e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C4	471 bytes

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