PDF malware analysis — malicious · 86c5fe348166b1c9

MALICIOUS

PDF

9.3 KB

MD5: 8362f3e4d0d4b74e79d00741178ec7ec SHA-1: 820fd2914882b29c3edde6faff466335779e06ce SHA-256: 86c5fe348166b1c96a16567f8f9241a80fbd37f58d7f2ffe681d492fac3e1456

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 Scripting: JavaScript T1204.002 Malicious File: Malicious File

The PDF file contains XFA forms and embedded JavaScript, indicated by the PDF_XFA and PDF_XFA_SCRIPT heuristics. The embedded JavaScript, deobfuscated.js, is likely responsible for executing a second-stage payload. The PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic further supports the presence of a script payload within the PDF. The PDF_EVAL heuristic suggests the use of JavaScript eval() for code execution.

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` `51d0ccf47df00ac0f082109f8c02e9b9ba6f40b0bf298d26b9c7c0a65472b807`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0x52	1163 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`deobfuscated.js` `31a6ba56eb898bcc781987a51256b92ea6da77478b4a9c458121e64dbc4b140f`	deobfuscated-js	PDF JavaScript deobfuscation pass	2001 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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