PDF malware analysis — malicious · 049202a42c668fa3

MALICIOUS

PDF

17.6 KB Created: 2010-03-17 09:19:02 Authoring application: BoplR8Dr (via IP0zCs7u2TV2)

MD5: 3928e7654046dd1ac5cd6b9cab278b38 SHA-1: ee259e46a03a71daf50fdbd85a1875d36500d856 SHA-256: 049202a42c668fa3f1de843fa68cea0704f1e45c7bf742cd56e6ff9d2ac59520

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript that utilizes eval() and fromCharCode functions, indicative of obfuscation and exploit execution. The ML classifier strongly flags this PDF as malicious. The JavaScript is likely responsible for downloading and executing a secondary payload, a common technique for initial compromise via malicious documents.

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.
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` `0a0566d1c0f2b062049c1f02aaa8270d30495d483c9deaccbc6a6339bef5274a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x240	16835 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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