PDF malware analysis — malicious · 13c44324bc23a308

MALICIOUS

PDF

1.5 KB

MD5: 284eca0a4ce947de9f212ccc94670ce5 SHA-1: 4ecb7a9e522e847b4ca6c81ec959ae0655d575e0 SHA-256: 13c44324bc23a308ed44040e3c4cf255dbec8ecb14f007b1e2dc73df9eaf6f7b

148 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is heavily obfuscated. Heuristics indicate this JavaScript is designed to exploit a PDF vulnerability, likely to download and execute a second-stage payload. The reconstructed URL from the script is http://www.example.com/path/to/evil.tld/download.exe, which is highly suspicious. The ML classifier also strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111111_000.js` `d61376b08657cdce5867e647fc0550ff74e9fc8759ef81a9d838e234039891ac`	pdf-javascript-stream	PDF /JS object 111111 at offset 0x160	2233 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`javascript_obj111112_001.js` `ff45ef07dc3eed076f7b292fd86f01a3a7fed9c247c1ef212ad6e2def5b4b204`	pdf-javascript-stream	PDF /JS object 111112 at offset 0x54E	66 bytes

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