PDF malware analysis — malicious · 45780bf0691e7a3b

MALICIOUS

PDF

7.9 KB

MD5: 4cad6c21b6c7b28fde8af7b702f2a8af SHA-1: 4bec2f314ecc9672bd0b51f08ebad9c4ab7a171c SHA-256: 45780bf0691e7a3b6db0fbb69ff74522add08ff0856724572d2fd4a78909f35f

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE firings, along with the deobfuscated JavaScript artifact, strongly suggests that the script is designed to execute obfuscated code. This obfuscated code likely involves dynamic code generation or evaluation, a common technique for downloading and executing further malicious payloads. The specific JavaScript functions like eval() and String.fromCharCode() are key indicators of this behavior.

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `d361b14081442acf49cf89f513d77962708305a1c3cc1d2ef4d9316522e7e98c`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	314 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `1ce0693b3ca4b367698b4e047ff581f495f45ee84e3d960a24c40b249e5db310`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1A42	1702 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.