PDF malware analysis — malicious · 6afd9f7c4deef660

MALICIOUS

PDF

7.2 KB

MD5: 39072c580f17d2c1858ae9a91f688cc7 SHA-1: 6f58c5f9a80c0d60ca6e5fe61a583b59ced14840 SHA-256: 6afd9f7c4deef66084230d51424e0be8e38057c3498c483b593a58f2edc770be

208 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a PDF file that contains obfuscated JavaScript. This JavaScript uses eval() and base64 decoding to execute a second-stage payload. The primary technique observed is the exploitation of PDF vulnerabilities to achieve client-side execution via JavaScript. The decoded string is a large base64 blob, likely containing further malicious code or a downloader.

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-3449 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-3449
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_obj0009_000.js` `b01e7554d0c8699ebd514e599e1ace8faf9250069e7986c1d92cb8303af1c976`	pdf-javascript-stream	PDF /JS object 9 at offset 0xDA	14098 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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