PDF malware analysis — malicious · e1da70d02784e3c9

MALICIOUS

PDF

118.7 KB

MD5: 10bf885ed21922a82c75bb0742f9d716 SHA-1: b91ab20c11d2785fb836e1dd76ba6310f058ba8c SHA-256: e1da70d02784e3c93398e72d3cbb0a49584fc58a2e76ce07b57994ae90b9de63

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including calls to eval() and String.fromCharCode, which are commonly used to obfuscate malicious code. The 'Large comment-padded JavaScript eval stager' heuristic and ClamAV detection 'Pdf.Exploit.Agent-36086' strongly indicate exploit activity. The JavaScript is likely designed to download and execute a second-stage payload, although the exact mechanism is obscured.

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` `4aec52c1db2487ba8f2b6d15379c45a46a964a239b5b5beb61488dc91fd4b5ec`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627216 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_001_off0001d71b.bin` `f799e0ccc25436239371f5e293a857da9b69406e6f90d75b1ac3ec97d73a81bd`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D71B	300 bytes

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