PDF malware analysis — malicious · 9a889cc47f36258e

MALICIOUS

PDF

4.0 KB

MD5: 50dcf691921f29e427038e3b60d22df6 SHA-1: 9d870f11f24e7223151a77626d7c587feb5be08c SHA-256: 9a889cc47f36258ec77900947528e184f2113551836ed1196bd910600075ecaa

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode(), suggesting it's designed to execute arbitrary code. The presence of deobfuscated JavaScript files (acroform_b64_00.js and javascript_obj0013_001.js) further supports this. The primary function of the script appears to be downloading and executing a second-stage payload, though the exact URL or execution method could not be fully reconstructed due to obfuscation.

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` `4bdcec62bf7f76ed42b250d7d96ae6b23234173cf5be5e5c56c5c230c7b74d79`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6321 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` `44219122e5cc1ef25ba3c61ec82a9935b1bce51830c0f93c5714fbd19a7cdf24`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3587 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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