PDF malware analysis — malicious · 0f671c15bec6f446

MALICIOUS

PDF

7.7 KB

MD5: 2af5f975f4044285499fd957e4bb9148 SHA-1: b752cabcf9726819c4d71550d655cff1fb97925c SHA-256: 0f671c15bec6f4461ecdef2598e31ac3ae15bb30b935242b5f899d9fb0b50bfe

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that uses eval() and String.fromCharCode() to deobfuscate and execute code. The script attempts to decrypt a string, 'marxisinfosvjm', which is likely a placeholder or part of a larger obfuscation scheme. The critical PDF_JS_EXPLOIT_CLUSTER heuristic firing, combined with the ML classifier, indicates a high likelihood of exploit execution. The primary function of the script appears to be downloading and executing a second-stage payload, though the exact URL is not directly present in the provided script.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `67b52abd3c8347ea784dd3896ef0d90f7e0b4c1d80364f526f97316be5023535`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	310 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off00001ca3.js` `41f9d40a0a1717dfeaa417fbac22a4f866001c49ea473ef38922d4fb348ac844`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1CA3	305 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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