PDF malware analysis — malicious · c4abf76f6c9ea92e

MALICIOUS

PDF

3.8 KB

MD5: 78849bdfd6681eb96f976b14531155e4 SHA-1: 55bd1b49b519ed242c2f6796bd982277282cfb3a SHA-256: c4abf76f6c9ea92edefa6dfc94e7475d2cd1824e81fb2d78fef3b52ff8aaaa1e

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 presence of a PDF_EVAL heuristic firing suggests that the JavaScript code is being executed using eval(), which is often used for obfuscation. The heuristic 'Suspicious extracted artifact' also flags obfuscation indicators within the extracted file 'javascript_obj111712_001.js'. This points towards a downloader or dropper functionality, where the script likely decodes and executes further malicious code, potentially from a remote source.

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_obj111711_000.js` `b6b34aaf51457c015ecde47a38610c333efdbab575756c3792a1ff8efccb8ba6`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	4717 bytes
`javascript_obj111712_001.js` `f7e8724aa91e55b8bd7c1b638fb4b62d6a166dcf72db86483a4fdfb252df0760`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xD47	483 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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