PDF malware analysis — malicious · 197fd19dd4f98309

MALICIOUS

PDF

3.2 KB

MD5: 000593e09d1d5d74a49f7f8ddcaa9ff4 SHA-1: 8d8cf4a6f7d2111ae65ea0691f83d85b35ccb1c9 SHA-256: 197fd19dd4f98309ae6439939d39c7967661fb75f65b0c568f6f1a0131c2b690

196 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 is heavily obfuscated and utilizes unescape() calls, indicating an attempt to exploit vulnerabilities. The JavaScript is designed to download and execute a secondary payload, as evidenced by the embedded 'exploit.swf' file and the ML classifier's high confidence in maliciousness. The primary attack vector is likely spearphishing, with the PDF serving as an attachment.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`exploit.swf` `09da31fcb002129249bb529a7f84709739a96f62781db5f4c6d9bf6e4308eb15`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x4D1	102 bytes
`javascript_obj0017_000.js` `8e228263f3bef898e54fca128c8691796cb03cb52c1463a0228ad25324fff41f`	pdf-javascript-stream	PDF /JS object 17 at offset 0x5EB	1246 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0017_001.js` `236dbe38a19426ceea9d7e23f06aa26440cd6750cf747fc7f099cb0cf9d4d2a6`	pdf-javascript-stream	PDF /JS object 17 at offset 0x5EB	1056 bytes

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