PDF malware analysis — malicious · 0a649adf45c8ff5a

MALICIOUS

PDF

2.5 KB

MD5: 90d0da66895c08a9ca7d70e1d044fd27 SHA-1: ed2248dc61c76793020a0de0ec19ce8a1ac2cf6c SHA-256: 0a649adf45c8ff5af2635bab107da758adabab14952218073f9c370bd89fc911

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains obfuscated JavaScript that utilizes `eval()` and `String.fromCharCode()` to execute malicious code. The script appears to be designed to download and execute a secondary payload, as indicated by the exploit cluster heuristics and the ML classifier's high confidence score. The exact URL or payload is not directly visible due to the obfuscation, but the execution of arbitrary code via JavaScript is clear.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `b2b6583b837fb302822635560fb00b49be9fbc85b8048e49bbc447c7bcc7e6d2`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	315 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_001_off0000035f.js` `e8f75598ea752996b2647dc2cf828f39b706918c7c433073947b948abb2ad3c7`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x35F	310 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `95bc6b40e5221c8c9fd376735cc96257b72eb30f8612d0cf8ac5a762a8141552`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x477	1813 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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