PDF malware analysis — malicious · 1c90fbcbcb9a4618

MALICIOUS

PDF

118.6 KB

MD5: 21ab3bac0bc0e8ba4063122c6a2ede22 SHA-1: 4a36180e44fa93a3690df7e3dcc666d11be15efb SHA-256: 1c90fbcbcb9a4618952f0a5cdf96e2edcc0372749bc179f7f36ae6e7f120d2a5

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious Link

The PDF contains embedded JavaScript, including a heavily padded eval stager, which is a common technique for obfuscating malicious code. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly indicates an exploit is present. The JavaScript likely downloads and executes a second-stage payload, although the specific URL or mechanism is not directly extractable from the provided evidence.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `c882b3ae302515054dbd379d3db2fa62dbe4920f21997d3ef78a1dbd3dc4eeb8`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626587 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).

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