PDF malware analysis — malicious · fd1676f1e0f3507a

MALICIOUS

PDF

15.3 KB

MD5: 4f08885651a86f66976140bf7dea6201 SHA-1: c7b152fa00c6e131279b231d22d45b4d46b1850b SHA-256: fd1676f1e0f3507aa1c51ebfeb6231a5429656bb07bea3003e6ced22399baa51

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 JavaScript stream exhibits obfuscation and uses eval() and String.fromCharCode() functions, suggesting it is designed to download and execute a second-stage payload. The specific nature of the payload or its download source could not be determined due to the obfuscation.

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` `576ca0d8c8c4163071d59ee1865310ba44c80401f3dbb1c1cfd3bd0f2207ca5f`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	300 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` `6bd1b3be526af9586e84dc162c37d1f2aed745a4207ee60456e57e75498edd1c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x195D	12167 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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