PDF malware analysis — malicious · 4fd9ea07272bf710

MALICIOUS

PDF

4.0 KB

MD5: 4606a38cfda4a975895f0d3d1b1c62b1 SHA-1: 2704e3ce2a6cc238cea3d74938c27b186658987e SHA-256: 4fd9ea07272bf71070653b6bb4e43bc4ff992414566d63932c9ee25f5d72b0f9

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 is heavily obfuscated, including the use of eval() and String.fromCharCode, as flagged by PDF_EVAL and PDF_FROMCHARCODE. The deobfuscated JavaScript, acroform_b64_00.js, likely performs malicious actions such as downloading and executing a second-stage payload. The presence of these obfuscated scripts and the high risk score suggest a malicious intent.

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_obj0013_001.js` `d8d5bcc7b732f2ffa14863800d8b9dac422b1a70ab0291ea356f673c6e0b0471`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6373 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `aabc6f411afe6bc6949c968613625945b864a26367cb86bb707e5e552ec6512e`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3627 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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