PDF malware analysis — malicious · 93bc7149f80b191c

MALICIOUS

PDF

1.5 KB

MD5: e40e5b147448a768f99b762e27dc001b SHA-1: 679d1c0b4cbb60f66cf72721909cc9d708078e16 SHA-256: 93bc7149f80b191c8fcc37a15f49fa6e835e29b1218bb420a96e403088b212ad

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly suggests maliciousness. The JavaScript is obfuscated, as suggested by the PDF_UNESCAPE heuristic and the 'Script obfuscation indicators' signal. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, as evidenced by the ML_NYX_PDF_MALICIOUS heuristic and the presence of multiple JavaScript streams. The extracted file names suggest these are the JavaScript components.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111111_000.js` `93b614117c22835135e71b575b8e54065c1e63910f4301d2ffcc9e30adb3269e`	pdf-javascript-stream	PDF /JS object 111111 at offset 0x160	2264 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).
`javascript_obj111112_001.js` `245453b748615283c400c4627c601e8a264c813057ab25c4674706ce9f73f0bc`	pdf-javascript-stream	PDF /JS object 111112 at offset 0x566	66 bytes

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