PDF malware analysis — malicious · 5c88b847f1a8e408

MALICIOUS

PDF

3.2 KB

MD5: 7b9092a6f4fb9b8f1e6aae4abe4813da SHA-1: e8c8d76300617ca7dac89e448141b8b234b00104 SHA-256: 5c88b847f1a8e408aeadd53456b505608f3e8d5810dbe454e85951d60b9df9a0

206 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 an unescape function, a common technique for obfuscating malicious code. The JavaScript attempts to call a function derived from the document's title, which is likely intended to download and execute a secondary payload. The critical heuristic firings and ClamAV detection strongly indicate a malicious PDF exploit.

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` `7429a54b40d0c8d06bab6598778f45f17bf553625eccce4897e3c135d961a2c3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C4	475 bytes

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