PDF malware analysis — malicious · e8b855a1feafb179

MALICIOUS

PDF

4.1 KB

MD5: 89c1becf03d1a536954ae74c6d4b5adb SHA-1: 9d672c13beb869267e3c1861ca615ed4d5b1a75a SHA-256: e8b855a1feafb1799f173d391b5a6fc6b848fc5d0e811211e0673b10ebb909bb

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The deobfuscated JavaScript stream (acroform_b64_00.js) suggests the script is designed to download and execute a secondary payload. The presence of eval() and String.fromCharCode() calls points to obfuscation techniques commonly used to hide malicious JavaScript. While the exact URL or payload is not directly visible due to obfuscation, the overall pattern is consistent with a malicious PDF dropper.

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` `29269dd76649d6f13b35ee938d77280a4063bfabb6b95179852a29817e9b0a70`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6413 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` `179d45454e586ac3410b81ec7a85d1e1f85951c15020fa10dbc891384f59e88e`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3656 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).

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