PDF malware analysis — malicious · 1ba8b35a74a927b9

MALICIOUS

PDF

4.0 KB

MD5: 5982deabad0f65d2d736a4074569a3f7 SHA-1: 90a2597491102b73a677543274d4efb7dd0051ec SHA-256: 1ba8b35a74a927b94883829f2fc3aaabdb63f53de458cabc5c8ee0b85254b093

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream utilizes eval() and String.fromCharCode, suggesting obfuscation to hide its malicious intent. The presence of two JavaScript artifacts, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', further supports the execution of potentially harmful code. The primary attack pattern involves leveraging these embedded scripts to achieve a malicious outcome, likely through code execution or further 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` `ad285b490556ec4bdaec8f2c18589bbe030b47373c7a932032422bd4833c5b5e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6365 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` `e19d3f2f0ce9ac4c767e963da988b132d40589f1302c997e8b0859c1f34174be`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3620 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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