PDF malware analysis — malicious · 11b55212c202e940

MALICIOUS

PDF

3.3 KB

MD5: d6c46a0fb84024c86565c56526f7780c SHA-1: 4959b8f6f1583e2e177c4106238aef21c177638f SHA-256: 11b55212c202e940ec7122134fd41facfee8ee2edf240982a79bca8a069b2a3f

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 the unescape() function, a common indicator of exploit code. The JavaScript attempts to execute a payload, as evidenced by the ML classifier and ClamAV detection. The reconstructed JavaScript payload is 'QVenSckl', which is then executed by the script.

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` `31668194e63945dc83f1e9f1d774ba1f153205bc35f2e1ba9dc49e4937c14396`	pdf-javascript-stream	PDF /JS object 7 at offset 0xA77	329 bytes

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