PDF malware analysis — malicious · 9d8d6bc4d2876654

MALICIOUS

PDF

5.3 KB Authoring application: zsrb

MD5: 2609d32448864c0949be5bf7096e7057 SHA-1: abec324c561d03d5813fc924e4fc26544cb3ccce SHA-256: 9d8d6bc4d28766544205320d00bfd64b3db2f7ddc1a67d1eaf69c96491ea4d04

134 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command and Shell T1059.007 JavaScript

The sample is a PDF document that contains an embedded JavaScript file. Static analysis identified a critical vulnerability, CVE-2010-0188, which is an Adobe Reader exploit targeting XFA forms. The ML classifier also strongly indicated maliciousness. The embedded JavaScript is likely responsible for executing the exploit and downloading a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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.
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
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_001_off000002b4.js` `8e82834f1b91fe9fcc64a5b2b4851853ab259dd5958deed5181c3bb81cc827f0`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2B4	75749 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s).

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