PDF malware analysis — malicious · 67440559c976db7f

MALICIOUS

PDF

8.0 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 5505d64f5d6fec16d46c3e2b5f563036 SHA-1: 933318a9c128b55ad1839d16502bd3e13ec3de6e SHA-256: 67440559c976db7f0bb86af792f5dfa2a68f817558f1dbb9fefb600f703b3e0a

216 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains obfuscated JavaScript, identified by heuristics such as PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The script utilizes String.fromCharCode and eval() to deobfuscate and execute code, a common technique for downloading and running further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a dropper.

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.Dropper.Agent-7268370-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7268370-0
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_obj0001_000.js` `bdbdc348a765ab9732daa2bbfa9f7e13bef3349a0c6cc578c0a5190d44326d31`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	929 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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