PDF malware analysis — malicious · 9fb4701e7d246049

MALICIOUS

PDF

1.9 KB

MD5: a1f1bcc66f3944173d7d9ad40e7b887a SHA-1: 5fcc9e92a2b4be6822adc93cab7c1b0880d71bf6 SHA-256: 9fb4701e7d2460496792e499abf5bc180a1485c0e3bbd32f05864c8027a832ed

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded and obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_UNESCAPE, and PDF_FROMCHARCODE. The primary heuristic suggests the JavaScript is designed to download and execute a second-stage payload. The presence of the extracted file 'javascript_obj0005_000.js' further supports this, although its content was too obfuscated to analyze directly. The attack pattern is therefore a malicious PDF leveraging JavaScript for payload delivery.

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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_obj0005_000.js` `4cff1e3024318e723daed72c3932d600c25e28c741b973c80285b079b353662c`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	5600 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).

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