PDF malware analysis — malicious · 733927caec430916

MALICIOUS

PDF

2.9 KB

MD5: edfa15aead1081a54eccbb23bae5d399 SHA-1: ae6e5a7de45c4dc1c5d1d3ff36cb411ea14ba0b8 SHA-256: 733927caec4309166bf2e67f19375564324b0ae93939bebe8f51ee6f504a56f2

208 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains obfuscated JavaScript that utilizes an eval() call, a common technique for executing malicious code. The script is designed to download and execute a second-stage payload, as indicated by the PDF JavaScript exploit cluster heuristic and ClamAV detection. The obfuscation and exploit cluster strongly suggest malicious intent, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
ClamAV: Pdf.Exploit.Agent-13203 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-13203
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `b7282f63aa7ee50fc871ab7a1a4b1f8a2bbea74a7dec9942df6ffecff0fe018e`	pdf-javascript-stream	PDF /JS object 7 at offset 0xDB	27767 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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