PDF malware analysis — malicious · 6f11290c0cb26591

MALICIOUS

PDF

1.8 KB

MD5: 101a78a2822ee31545a17c1479b7c740 SHA-1: ce2009b5822d3c80d43b413a0f114835dbd859ec SHA-256: 6f11290c0cb265911bed32d289d775f23007b13c2ae614885c792eabf13de5cc

148 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 and a spray technique to allocate memory and likely execute shellcode. The heuristics indicate a PDF JavaScript exploit cluster, confirming the exploitation of a vulnerability. The primary purpose appears to be the execution of a second-stage payload, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `d6afcb584fdbd78d6e7ccbc0c02615a63d401d2f23700a9bbc0d350fd277eac0`	pdf-javascript-stream	PDF /JS object 5 at offset 0xEA	1337 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `79cf3cef9e89a3079162c26456cbedaf96ee843a2f699812a9997a4a6841baf1`	pdf-javascript-stream	PDF /JS object 5 at offset 0xEA	38 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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