Pdf.Dropper.Agent-7278049-0 PDF malware analysis — malicious · 833f3eec465d1909

MALICIOUS

PDF

2.1 KB

MD5: 5d6efb2fd0d0c64c3c6d6ec231c495bd SHA-1: 61dbcf0170cce6a6da25400f994c03f0468aa7ef SHA-256: 833f3eec465d1909e1c340dd527f22105f51bdb92cc0e556b1631db3a46a2705

256 Risk Score

Malware Insights

Pdf.Dropper.Agent-7278049-0 · confidence 95%

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicating an attempt to obfuscate and execute malicious code. The JavaScript stream is further obfuscated using String.fromCharCode, a common technique for evading static analysis. This cluster of indicators strongly suggests the PDF is a dropper designed to download and execute a secondary payload, as confirmed by ClamAV detection and ML classification.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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.
ClamAV: Pdf.Dropper.Agent-7278049-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7278049-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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_obj111611_000.js` `9864171cc4152f5d3e5671809dd40cebe1cf9319d0b8bfb0abd003cff50482db`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x75B	332 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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