PDF malware analysis — malicious · 5f54d940b716329b

MALICIOUS

PDF

14.6 KB

MD5: a34f28f397c92e798041e6d41f6d19e5 SHA-1: cbd07d6ad50d389613fc6431165067fa7d6d1d75 SHA-256: 5f54d940b716329bd3a8bf6bba162138c1cc9d63dcdfa1b81292528ca3e989bd

216 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript that utilizes String.fromCharCode and eval() to execute obfuscated code. This pattern is commonly used to download and execute a second-stage payload. The ClamAV detection 'Pdf.Exploit.Dropped-94' further supports this assessment. The specific JavaScript code attempts to deobfuscate and execute a string, likely a malicious command or URL.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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.Dropped-94 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-94
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.
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.
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_obj0076_000.js` `c28effae366bd4b2a63fe29aea090a07947ae4e73aa9efc1cf87e16e006e7288`	pdf-javascript-stream	PDF /JS object 76 at offset 0x3920	144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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