PDF malware analysis — malicious · 14035f1c15f8c2e1

MALICIOUS

PDF

3.2 KB

MD5: 2a8e8f8ad469ff54db55653377ceef27 SHA-1: 53ea9a46fb87e9b50810f6a1fdb8ac137da84a24 SHA-256: 14035f1c15f8c2e1c7ff56d439ade35cb70d84ef0d775ef98b1456db5236d0e2

206 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a PDF containing embedded JavaScript, flagged by multiple heuristics as malicious and specifically identified as a PDF JavaScript exploit cluster. The JavaScript code appears to be obfuscated but attempts to extract characters from the PDF's title property to construct a string, which is then passed to a function likely intended to download and execute a second-stage payload. This behavior is consistent with a malicious PDF dropper.

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` `17f6d089d313425cb9899831291616cecf60de5b9d17b738147e9e6d5b1aad4e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9C4	424 bytes

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