PDF malware analysis — malicious · e1f3e91ad8637db6

MALICIOUS

PDF

4.1 KB

MD5: 1a162aa1b604691671fb1807e64f7e59 SHA-1: b2aeadf6718962b1bb5f2178342b4fb06cfb68b2 SHA-256: e1f3e91ad8637db6986286b760541c0c76ebf99e6ca5a4dce8d9891809fd1644

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', likely contains code to download and execute a secondary payload. The presence of 'eval()' and 'String.fromCharCode' suggests obfuscation techniques commonly used to hide malicious intent. While no specific family is identified, the delivery mechanism points to a downloader or 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` `2ddc8c42b6ebf67182a72eb95a1b66acac2d53e7f7dec5070f34ffae18bfa8c3`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6329 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` `87873b1affddc16869e3fe0ce91e7dcb5ec54e0871d3517578a68e7637356637`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3592 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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