PDF malware analysis — malicious · bd73c0f0a857c41c

MALICIOUS

PDF

15.7 KB

MD5: 1a3c9e44e463e8682f3e7bf7c7d19f2d SHA-1: 257ca14e0a32caecc61e05477dc8a02c70a657dc SHA-256: bd73c0f0a857c41cac2a21bdd41da03abe5c5842cd213ec9c735d43bd90d87b2

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The 'Large comment-padded JavaScript eval stager' heuristic suggests a common technique for obfuscating malicious code. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is the primary artifact. While the exact payload is not visible in the static analysis, the presence of eval() and the stager heuristic strongly imply that this script is designed to download and execute a second-stage payload. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms the malicious nature of the file.

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` `94156f5c33b003ca79b7d0c0562be1075b1f9a7a6f736c1f599079fd136fcff0`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425188 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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