PDF malware analysis — malicious · 7cfc1d99ae484821

MALICIOUS

PDF

118.4 KB

MD5: 82452120580682816bfb0c385525ecb1 SHA-1: cbe3e76e1e27569e090da86846628e1d6dc7f48c SHA-256: 7cfc1d99ae4848210bf0a03e7ca5f37e01345eed29e5c87463410e08d4950d6d

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript, including obfuscated code that utilizes eval() and String.fromCharCode. Heuristics indicate a 'Large comment-padded JavaScript eval stager', suggesting the script is designed to deobfuscate and execute further malicious code. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly supports a malicious intent, likely involving exploitation of PDF vulnerabilities or delivery of a secondary 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` `ce387efb74fc5ba03d0a6ea71f6370ddd20b79b4d7866d56fea284e06851a562`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626943 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_off0001d7f2.bin` `12b9b39f07be0104c9081f549ec7ca80586c67c16ad8da469ae442c9f594ed03`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D7F2	200 bytes

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