Js.Trojan.Agent — PDF malware analysis

Static analysis result for SHA-256 be43562474741b3e…

MALICIOUS

PDF

9.6 KB
MD5: 1cb8e24a5cc910b7d8f26c9e8b828e3b SHA-1: 94172ba27c70c375858b3c246307d60144ca0bbe SHA-256: be43562474741b3eb4097c23ab3ad2bf0064f974a2124b11f1f845ba28975226
224 Risk Score

Malware Insights

Js.Trojan.Agent · confidence 95%

MITRE ATT&CK
T1204.002 Malicious File T1059.007 JavaScript

The PDF exploits CVE-2010-0188, a known vulnerability in Adobe Reader related to LibTIFF XFA image parsing. ClamAV detected the sample as Js.Trojan.Agent, indicating the embedded payload is a JavaScript-based Trojan. The embedded URL is likely related to the XFA form structure, but the primary threat comes from the exploit and the JavaScript payload.

Heuristics 8

  • 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.
  • ClamAV: Js.Trojan.Agent-36967 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Js.Trojan.Agent-36967
  • 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.
  • 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
  • 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-locale-set/2.1/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0041.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 41 at offset 0xE61 85 bytes
embedded_file_obj0042.bin
dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0xF13 1029 bytes
embedded_file_obj0111.bin
2f69a6e3f6c22313937a40121ab7efe7b69653a71acbb158cb6a98fef8ee75ed		 pdf-embedded-file PDF EmbeddedFile object 111 at offset 0x112D 53447 bytes
Detection
ClamAV: Js.Trojan.Agent-36967
Obfuscation or payload: unlikely
embedded_file_obj0044.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x212D 144 bytes
embedded_file_obj0045.bin
10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275		 pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x21DA 77 bytes

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