PDF malware analysis — malicious · c4a1791c422d0847

MALICIOUS

PDF

18.7 KB Created: 2009-01-35 62:12:26 Authoring application: Adobe

MD5: ff29400a5464fac22c56188a13a230a7 SHA-1: d8a189c8946af831cf21095ed4dca7f10aab8b07 SHA-256: c4a1791c422d084724b500a7823b59fa87ce8bb22fb5394fa30fe06399134e85

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains multiple embedded JavaScript streams, with one stream exhibiting significant obfuscation and the use of eval() and String.fromCharCode(). These techniques strongly suggest the script is designed to download and execute a second-stage payload. The presence of multiple obfuscated JavaScript artifacts indicates a complex delivery mechanism, but without further deobfuscation or network analysis, the specific family remains unknown.

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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `de23ea45f923dc4c4cadbd8882af723c15a46373e0721bd31ad117980e24c3cd`	pdf-javascript-stream	PDF /JS object 12 at offset 0x31E7	6293 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `f405c893770b76e87313d36a02d672aa7939eb7f30e49794a597b12ec15648b5`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3AD4	6584 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0014_002.js` `89110a4aca44de6701bbb345264604bc37dcc3f37ba1856feaa313e0617ebc87`	pdf-javascript-stream	PDF /JS object 14 at offset 0x4405	2733 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_000_off000001be.js` `3462f672e11a50d33edc53e22eb2a6eb0c68bcfbe5e3d34e1e5d719c21a24342`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1BE	127101 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_001_off000014c4.js` `ab0ec784af90cb08f323f77fbc07b8d0c097a0e59a9a7e24bb210cf4419e0722`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x14C4	72305 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off00002364.js` `a52734f670dbb3fae20308021ecb8697c5ee0b1da9d6e4abd8de0c2eaa718925`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2364	79832 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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