PDF malware analysis — malicious · 98d4fd809c0d7782

MALICIOUS

PDF

15.0 KB

MD5: 5bef568ae325d50cd708d23f71a1df4c SHA-1: 2d7def67dd72ef70aa47b24263f35ac803bcdac7 SHA-256: 98d4fd809c0d7782b7275b8270efa089d8da45bac8f4ea54caa10e4ae26af8e8

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of 'eval()' and 'String.fromCharCode' suggests obfuscated JavaScript code is being executed. The extracted JavaScript files, 'javascript_obj0005_000.js' and 'stream_001_off000006f5.js', are suspicious artifacts. The primary function of this script appears to be downloading and executing a secondary payload, a common technique for initial access.

Heuristics 5

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `289cd5fdba72a1261893692aa5e3d81f0aca0232ddbc9cc4457a430ecc496c9e`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	3287 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_001_off000006f5.js` `5ee857236b2e963f1ce71fefee0542d7e72ceefd23215b57a5e31c40b96f86a9`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x6F5	124991 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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