PDF malware analysis — malicious · 2129c782ef8056d7

MALICIOUS

PDF

8.2 KB

MD5: 82e34bc98547b317bdf7580981102b92 SHA-1: b91b2eb309a1be9a75aa355ada11e7b9ab283deb SHA-256: 2129c782ef8056d7a704115447f9ee7c8bff95c406f77928d9772b7676a5a92d

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The deobfuscated JavaScript stream suggests the script is designed to download and execute a second-stage payload. The presence of `eval()` and `String.fromCharCode` points to obfuscation techniques commonly used to hide malicious code. While no specific URLs or hashes were extracted, the primary function appears to be payload delivery.

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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_obj0069_000.js` `54713131ffda82f767fc42614f3000c9f1e76766cdf863499b629ecc3c8c1693`	pdf-javascript-stream	PDF /JS object 69 at offset 0x1BF	9512 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `3248ac6ea3724f697457050466442c0f5ddb897e7c99e2af75437af3ca50d9a3`	deobfuscated-js	PDF JavaScript deobfuscation pass	19218 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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