PDF malware analysis — malicious · ef77d2a5e4fba900

MALICIOUS

PDF

118.8 KB

MD5: add005e678f0a1a069e93d267f34b37d SHA-1: 854fbe1e95ef55c9fa4599308495753920f63076 SHA-256: ef77d2a5e4fba900622c8db3d97a1ade619d48396e8e859eadd2c6824726a40d

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a call to eval() and the use of String.fromCharCode, which are common techniques for obfuscating malicious code. The 'Large comment-padded JavaScript eval stager' heuristic indicates a sophisticated steganographic approach to hide the payload. ClamAV detection as 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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_obj0006_000.js` `24750df13faa4bb9c4b92217c7622c76c73a76d406c026ddb877b8efc07b6c39`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627693 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).
`stream_002_off0001d993.bin` `dd35de55dde0bf19a09ea39c33ac9b163890a53e6c22a8ffc4f3f11a55929109`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D993	200 bytes

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