PDF malware analysis — malicious · 944e7f6b52abe4b4

MALICIOUS

PDF

2.8 KB

MD5: 8fdc3900a8e6e9c547dfc372244c0a99 SHA-1: 3487c34013a4f9492bec4df156b0324fb4d1fbc2 SHA-256: 944e7f6b52abe4b4e6b6684304c56bf41508fdbabb67bc9f1ec500263804d754

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 presence of PDF_EVAL and PDF_FROMCHARCODE firings strongly suggests that the JavaScript is obfuscated and uses dynamic code execution. The extracted JavaScript files, 'javascript_obj111611_000.js' and 'javascript_obj111612_001.js', are likely responsible for downloading and executing a second-stage payload. The obfuscation techniques used make it difficult to determine the exact payload or final destination without further dynamic analysis.

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_obj111611_000.js` `e49ad805823291e0094f1b9c481d71c56ef9d2cddbfbe00ad62ddf6dde38d606`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `b0555c5f2a812278ce05608e01bf21c571f64ef8bbe3e3c0b2e3bba87119ea46`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x266	3363 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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