PDF malware analysis — malicious · 77882faad08f4002

MALICIOUS

PDF

5.1 KB

MD5: 36b1cc1d917f9223b88a55f069e48bd3 SHA-1: 8e6b893d2795962601114bb9ecf544823b987822 SHA-256: 77882faad08f40022c088b5cf352397a0bdcb5f2e992c0837e04bf5f2c24a0ef

66 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream includes an eval() call and String.fromCharCode, suggesting obfuscation and dynamic code execution. The primary function of the embedded script appears to be downloading and executing a second-stage payload, as evidenced by the extracted artifact 'javascript_obj64759_000.js'. The obfuscation indicators and the nature of the script point towards a downloader or droppper functionality.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj64759_000.js` `daf7db96637ef486b445623174e951c3b5e9dbb5a15af50ca32a69f4080f5d79`	pdf-javascript-stream	PDF /JS object 64759 at offset 0x138	8357 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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