PDF malware analysis — malicious · d0f31ae2d182556a

MALICIOUS

PDF

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

MD5: 409bc7dfa6d249ff48e8e9a51a53ca75 SHA-1: 18be7b9cd29723697ac6643d71ec0e8fb5913a53 SHA-256: d0f31ae2d182556a4a2ce7e45516640dac4569721aedfccc49e407b848cbf971

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes String.fromCharCode and an eval() call, suggesting obfuscation to hide its malicious intent. The primary function of the script appears to be downloading and executing a second-stage payload, as evidenced by the suspicious extracted artifact javascript_obj0001_000.js. The file's authoring application also hints at JavaScript usage.

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.
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` `49136af03ee15c9f7c7a2a63a6286e4447d346e20231c89d4420d5ffcce06699`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	521 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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