PDF malware analysis — malicious · 84b49eaa4448d786

MALICIOUS

PDF

4.1 KB

MD5: 73bded04d233dcf94fd5b305607da7c0 SHA-1: 813045f364bf86f809ee5fcdeccdca646dbfe154 SHA-256: 84b49eaa4448d786e63a6d5b2cf09b1ee334e20c15d541d1d4ea159ccd9abc25

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded and obfuscated JavaScript, indicated by multiple PDF-specific heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_FROMCHARCODE. The presence of 'eval()' and 'String.fromCharCode' suggests the script is designed to deobfuscate and execute malicious code. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for downloading and executing a second-stage payload, although their specific actions are obscured by obfuscation. The file's structure and the nature of the embedded scripts point towards a common PDF-based malware delivery technique.

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` `110138c080c92c18e02eb954f3b26e33ab5d31c4f0fcb017c56db24be2b2832e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6337 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` `5a055e223e4f69e0eea94d22173e8545183e76005e135ad5a1b535e3c588b442`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3599 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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