PDF malware analysis — malicious · db20b6cd198b4f84

MALICIOUS

PDF

4.0 KB

MD5: 49c4b14ad1fd9ea467f6eb11c959ba1a SHA-1: 9a528f552d98593ee555f258db8f9ac93edf0167 SHA-256: db20b6cd198b4f840a7346ef023b770402827ef40068790d317085659912af35

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Attachment

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 JavaScript stream suggest obfuscation and dynamic code execution. The extracted JavaScript files, `acroform_b64_00.js` and `javascript_obj0013_001.js`, are likely responsible for executing the malicious payload. The overall attack pattern is consistent with a malicious document used for initial payload 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_obj0013_001.js` `e1bb00de84dff92fa54f7007482d82114ff08cf512a30f227aca234a7372bde0`	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` `ca72dea92ed87518820397091ff699cd38ec94de8edb8ab27c9d776ce65b3329`	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.