PDF malware analysis — malicious · 69cc960fa317ca86

MALICIOUS

PDF

24.2 KB

MD5: 728f1bcbeda4202b40e89329be0fe104 SHA-1: a374b806cdacc46c2b8dd11cad2d1a9fa12b295b SHA-256: 69cc960fa317ca86f53f906d2f7ce84c7f0b0729bd6a935f569295a1d0347b56

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, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'PDF_UNESCAPE' and 'PDF_JS_EXPLOIT_CLUSTER' heuristics suggest the JavaScript is obfuscated and likely exploits a known vulnerability to achieve code execution. The ML classifier strongly flags the PDF as malicious. The primary IOC is the embedded JavaScript file itself, which is responsible for the malicious behavior.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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 (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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `1a48f862d80a5f2d489d2fc57c7f8807fed31c7d4e7ca249168542666f3cfac7`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD6	21670 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.