PDF malware analysis — malicious · 2864a947999ed815

MALICIOUS

PDF

118.8 KB

MD5: b8a98960cfa8c9148b18b22d146b8d7a SHA-1: 83cc9a72c89711460918020d7717c3bbe4ffa4ad SHA-256: 2864a947999ed815b0dadf15b57883c07e1f12d0b85176fa236562da8869cf19

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities. The presence of `eval()` calls and `String.fromCharCode` within the JavaScript stream, along with a 'Large comment-padded JavaScript eval stager' heuristic, strongly suggests the script is designed to deobfuscate and execute a malicious payload. ClamAV detection as 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The exact payload and delivery mechanism are not fully discernible from the provided evidence, but the overall pattern points to a PDF-based exploit.

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` `09f53f7aebcd425adaa8f0cdaf7e042ec77b3c15dcb72f3df45b3a693d88d839`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627413 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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