PDF malware analysis — malicious · bd2815f303c22c4d

MALICIOUS

PDF

118.6 KB

MD5: 01ef28cbf7efb38dce418fec68fdd9f5 SHA-1: 368c52516d9c10013611faf8d01b7955fb6e58d2 SHA-256: bd2815f303c22c4d4acc9d58ce50644a2b8c8fcb0bf78f0aaeaa025e10c2a3d2

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript, including a large comment-padded eval stager, indicating an attempt to obfuscate malicious code execution. The presence of `eval()` and `String.fromCharCode` within the JavaScript stream strongly suggests the execution of arbitrary code. ClamAV detection as 'Pdf.Exploit.Agent-36086' further confirms its malicious nature, likely involving the exploitation of a PDF vulnerability to download and execute 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` `9c447b8741851428d099ba79e468c3408044fc9bf691c8ac8613dc1f286d3087`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626374 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_off0001d6da.bin` `f3e8a49934e279773ddcf49fdaa80c7d26fe00ec8339d563877f843d86af2229`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D6DA	300 bytes

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