PDF malware analysis — malicious · 78bde4809d6eb54d

MALICIOUS

PDF

12.4 KB

MD5: eb7cbf95eb901ba0b8e99c99adb764fd SHA-1: 41cd10b66137e0a0f9b1c25fdcb3fb46df5bff96 SHA-256: 78bde4809d6eb54d56208e000fcce43cef78c364b6b36bf8a1af51db8e1814c7

312 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file that leverages an XFA form to execute embedded JavaScript. This script is designed to exploit the CVE-2010-0188 vulnerability in Adobe Reader, which is a known exploit for client execution. The ClamAV detection on an extracted artifact (Js.Exploit.HTML-28) further confirms the malicious nature of the embedded script, likely serving as a downloader for a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 10

Adobe Reader LibTIFF XFA image exploit — CVE-2010-0188 critical CVE likely CVE_2010_0188

PDF contains the CVE-2010-0188 exploit template: XFA JavaScript heap-spray setup, a generated TIFF image payload, and assignment of that TIFF data to an XFA image field rawValue to trigger Adobe Reader's LibTIFF parser.
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
Embedded script payload in PDF stream low 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.
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://www.xfa.org/schema/xfa-template/2.5/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_pdf_script_000003ca.bin` `86b7f304280530041fc7857f3c5d73a662c68b4a66339b34ca4dfeba0f4a05f5`	pdf-embedded-script	PDF raw stream script payload at offset 0x3CA	11711 bytes
Detection ClamAV: Js.Exploit.HTML-28 Obfuscation or payload: unlikely

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