PDF malware analysis — malicious · 4d100ebfe4d0d18e

MALICIOUS

PDF

4.0 KB

MD5: 715c137ffac745e20338b2e0faf6b52d SHA-1: 6e28b639440a3143cfbdb8c9d8fca7e21c324fbb SHA-256: 4d100ebfe4d0d18ed33c645e65a01bad7a41c96575c042f00936405619249d99

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The `eval()` call and `String.fromCharCode` usage within the decoded stream suggest obfuscation. The extracted JavaScript files, `acroform_b64_00.js` and `javascript_obj0013_001.js`, likely contain code designed to download and execute a second-stage payload, contributing to the malicious verdict.

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_obj0013_001.js` `bc64fc26ffcc1ef730293130919ccc330765dba2208555e102ef91f73ffcb703`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6309 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `9ec55cb3f810fa9bb06aa97334e994eeee0a7ccc85c8b279e9f0c96a93204261`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3577 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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