PDF malware analysis — malicious · 7848ba3039effc69

MALICIOUS

PDF

5.1 KB

MD5: 1cd86b3bab3094254555fe79e023a38a SHA-1: 95c76aa9c5d62e64a7d5ca42b501d859b9ec8444 SHA-256: 7848ba3039effc69b37a01bde92d436af80143e2c31e0cc9b3e700d2b9f9dc54

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains obfuscated JavaScript that utilizes eval() and String.fromCharCode(), indicating an attempt to hide malicious code. The ML classifier strongly flags this PDF as malicious. The extracted JavaScript file, 'javascript_obj879130_000.js', is the primary artifact, likely responsible for executing the exploit and downloading further stages.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
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. (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_obj879130_000.js` `95ffbf91ccc836a15722c343249b2cdd68b2d599afad2dcf703d2c58d021a4e8`	pdf-javascript-stream	PDF /JS object 879130 at offset 0x134	8357 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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