PDF malware analysis — malicious · 5ed34a09b2f8df9a

MALICIOUS

PDF

3.6 KB

MD5: 731afa47d18b96b550df2a5f23f166a1 SHA-1: 888b7393a4c702ebe15cd4a62043bb56d3728bc1 SHA-256: 5ed34a09b2f8df9a6229f1c66db0c6d15e3b8a6b4df80f7e2a2ab1af7ab9ccbc

148 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_JS_EXPLOIT_CLUSTER'. The JavaScript uses eval() and string concatenation to hide its true functionality, which is typical for malware attempting to download and execute further stages. The ML classifier also strongly flagged this PDF as malicious. Due to the obfuscation, the exact payload and C2 infrastructure could not be determined, hence the 'unknown family' designation.

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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_obj0001_000.js` `3412d8b3f19e6866433bbe4b039e3b9c46217df1abac315b4a4ff8f5aae05612`	pdf-javascript-stream	PDF /JS object 1 at offset 0x9	54088 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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