PDF malware analysis — malicious · ece46a8d6be31f2f

MALICIOUS

PDF

9.2 KB

MD5: dc59ac9865a5c625de6426ba53fef5a8 SHA-1: bb348199492363905f3a72f733d113fc46118911 SHA-256: ece46a8d6be31f2f6032c5e92d49aaf2c14d9f0348d11899f7e036c85aca158b

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged as malicious by an ML classifier and contains obfuscated JavaScript. The JavaScript stream, identified as 'javascript_obj0007_000.js', likely contains code to download and execute a second-stage payload, indicated by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristic firings. The 'unescape()' call further suggests obfuscation techniques were used to hide the malicious script's true nature.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `761d7556ea59a50dd40a8f61271a17132bca0a9f12882fd3a72c3bc95b83848f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	45699 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 222 eval/decoder/string-building token(s).

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