PDF malware analysis — malicious · 171a280602cd5922

MALICIOUS

PDF

3.8 KB

MD5: 9d3ba4aa8c80b04d803a1e4506dd3f0d SHA-1: 6b913072726b585b26e028a5935296c08b5aa904 SHA-256: 171a280602cd5922d784b444e46c648690209d98e595618df7ebbd8f4541ba8d

116 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript, flagged by multiple heuristics as malicious and an exploit cluster. The JavaScript is heavily obfuscated but appears to be responsible for downloading and executing a second-stage payload, as indicated by the 'ML_NYX_PDF_MALICIOUS' heuristic and the presence of a large JavaScript stream. The primary IOC is the embedded JavaScript file itself.

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.
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_obj0038_000.js` `28d2877342a508ff258c72043fe91468c5fe6191573025073ff1dd8388b735c0`	pdf-javascript-stream	PDF /JS object 38 at offset 0x43	16410 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.