PDF malware analysis — malicious · 6fed83bfb959656e

MALICIOUS

PDF

6.3 KB Authoring application: Jganbo

MD5: fdb6c297f973cfe718021d6fb30acab7 SHA-1: 56682533c8d8a052f09d2a4ad784ddbed420c50d SHA-256: 6fed83bfb959656e9509d365bd1f4a4770e81f848e516220dece797f817387b0

156 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF contains obfuscated JavaScript that utilizes unescape() and String.fromCharCode() to construct malicious code. The script likely decodes and executes a second-stage payload, indicated by the 'PDF JavaScript exploit cluster' heuristic. The primary function of the script appears to be downloading and executing further malicious content, which is a common tactic for initial compromise via spearphishing attachments.

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.
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.
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_obj0018_000.js` `c2a54dde13df085137a9e0e810ceb62443e08bdbfc6af303934c48e334af81c5`	pdf-javascript-stream	PDF /JS object 18 at offset 0x151C	341 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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