PDF malware analysis — malicious · 195603bfa7e70937

MALICIOUS

PDF

1.1 KB

MD5: 9567e6751b0beb2e4f2ca1b208344182 SHA-1: cf8f068088787e718a034bc0b40ffca86dbed35e SHA-256: 195603bfa7e7093712c58d400935d151f4444d12847937f3ed438dd8fa2a0143

156 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 that uses `eval()` and `String.fromCharCode()` to decrypt and execute code. The decrypted string 'cwbdwpmbbkqmcbwfy' is likely a placeholder or part of the obfuscation, and the script's primary function appears to be downloading and executing a secondary payload, indicated by the PDF_JS_EXPLOIT_CLUSTER heuristic. The ML classifier strongly flags this as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj0005_000.js` `5c8f7668c1eb1900a3f213b192467a3632ca7dcdee8e4807c3e92d3cf659a4a7`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	313 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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