PDF malware analysis — malicious · 1259ff49312f7ffc

MALICIOUS

PDF

1.5 KB

MD5: 74fbe0a671108337ce60b2be51c93d5b SHA-1: fa1e31794f4448d05b148aa9472a3f80a3b1c540 SHA-256: 1259ff49312f7ffc7ca0d152cacc62272dc0c8f09d05cd55c974619f72fbc490

148 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript that utilizes an unescape function, a common indicator of exploit code. The ML classifier strongly suggests maliciousness. The script likely attempts to download and execute a second-stage payload, indicated by the PDF JavaScript exploit cluster heuristic. The presence of JavaScript points to T1059.007, and the overall behavior suggests exploitation for client execution (T1203). Given it's a PDF, the initial access vector is likely Spearphishing Attachment (T1566.001).

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 (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_obj111111_000.js` `36a523d4c00991a235732a62520bc9fcd1d34901665a72af46c40d8d46a69507`	pdf-javascript-stream	PDF /JS object 111111 at offset 0x160	2496 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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