PDF malware analysis — malicious · cf1e60ed2ad3d478

MALICIOUS

PDF

15.8 KB

MD5: 53b61488e01b258c79c0d9404e0e3fb5 SHA-1: 2853752fdb88002ce454c35c6309ee826660108b SHA-256: cf1e60ed2ad3d478ab21c0fad33ee00764b3e1b23cdd3ee393bbd62587ddefcd

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL heuristic firing, along with the presence of String.fromCharCode, suggests that the JavaScript is obfuscated and likely uses eval() to execute malicious code. The deobfuscated JavaScript stream is substantial, implying a complex payload. The primary function of this script appears to be downloading and executing a secondary payload from a remote source, which is a common technique for malware delivery.

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` `e220f82e7d2c60915980c96b29b090706dcd235cfd8962344b9e928d6cec025e`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	309 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` `17a4723a6a359cfa505283ed51076938f9c7950e03040179c5a0de6da97fefb0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1A86	12021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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