Pdf.Dropper.Agent-7328757-0 PDF malware analysis — malicious · fe1fc72b2b80cf90

MALICIOUS

PDF

2.0 KB

MD5: 45c3ce6c86a1e517090a94473db0dcc2 SHA-1: f5930a60c5c577f23c74ae17384f4ed1a065be18 SHA-256: fe1fc72b2b80cf90fa9864351691d97300fcd497867634995a2240ecb74702d6

256 Risk Score

Malware Insights

Pdf.Dropper.Agent-7328757-0 · confidence 95%

MITRE ATT&CK

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

The PDF file contains obfuscated JavaScript that utilizes eval() and unescape() functions, indicating an attempt to execute malicious code. The script likely downloads and executes a second-stage payload, as suggested by the critical PDF_JS_EXPLOIT_CLUSTER heuristic and ClamAV detection. The ML classifier also strongly indicates maliciousness.

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-7328757-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7328757-0
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 0x6F0	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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