PDF malware analysis — malicious · fb7a1a069f3e6e36

MALICIOUS

PDF

118.7 KB

MD5: b4855fbd86751317f3082d1dfa4b54e1 SHA-1: d9b306cefe52f01512c69c82175610419ee955f1 SHA-256: fb7a1a069f3e6e368a59e3bb017ad849bc0e2a8923e13340120dd450266c7634

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 presence of 'eval()' and 'String.fromCharCode' suggests obfuscated code execution. A critical ClamAV detection of 'Pdf.Exploit.Agent-36086' strongly suggests malicious intent, likely involving exploit delivery. The large JavaScript stream and the 'Long encoded blob, Script obfuscation indicators' triage signal further support this. The exact payload and delivery mechanism are not fully discernible due to obfuscation, 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` `48ad4a6610ddaee21f8f6ead6ceecee67f44434c11fb70f918b35217cd7039ad`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626704 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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