PDF malware analysis — malicious · 89de5f97d865d183

MALICIOUS

PDF

9.5 KB

MD5: 5e33be4cbbf679abec4ce7c0f7c7bce6 SHA-1: 258c7c1c4c27b17db7fbae95af4fa4ed109ce977 SHA-256: 89de5f97d865d183428b7b06fa49819c66df584448439f4fd16d50c18ff73e4f

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 Service Execution: JavaScript T1204.002 Malicious File: Malicious JavaScript

The PDF file contains XFA forms with embedded JavaScript, identified by high-severity heuristics like PDF_EVAL and PDF_XFA_SCRIPT. The embedded JavaScript, found in 'deobfuscated.js', is likely responsible for executing a second-stage payload. The presence of 'eval()' and 'String.fromCharCode' further indicates obfuscation and dynamic code execution. The overall attack pattern suggests a malicious PDF designed to exploit vulnerabilities or trick the user into executing embedded code.

Heuristics 7

XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT

PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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
`embedded_file_obj0041.bin` `cc69bd4a8c2ed175a38f9f50062a6a30c7121c19ac9286a2767a47839f9ca0d9`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0x52	1161 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`deobfuscated.js` `91ab270fe3f18a0580b98a5a230f4ff5014e4b0a647e60a82a344ec786cdb6fe`	deobfuscated-js	PDF JavaScript deobfuscation pass	2372 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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