Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bcb907bd196584…

MALICIOUS

PDF

13.9 KB First seen: 2013-08-22
MD5: 6751d3c99b9152fc72a40e22b67c61a5 SHA-1: ce52297c1b880bdb56496dddfae286e3f708d891 SHA-256: d0bcb907bd19658401322fb93c8fcc9c63870fc61c18d8d0e03075db7d48bcc6
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file exhibits multiple indicators of malicious intent, including embedded files and scripts. The presence of an embedded script payload (PDF_EMBEDDED_SCRIPT_PAYLOAD) strongly suggests an attempt to execute arbitrary code. The embedded URL, while seemingly benign, could be part of a larger attack chain. The XFA form and AcroForm button heuristics further indicate a complex document structure often used for obfuscation or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 script payload in PDF stream info 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.
  • 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.
  • 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/ In PDF document text
    • http://ns.adobe.com/xdp/In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0041.bin pdf-embedded-file PDF EmbeddedFile object 41 at offset 0xB02 85 bytes
SHA-256: c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb
embedded_file_obj0042.bin pdf-embedded-file PDF EmbeddedFile object 42 at offset 0xBB4 1029 bytes
SHA-256: dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91
embedded_file_obj0121.bin pdf-embedded-file PDF EmbeddedFile object 121 at offset 0xDCE 65096 bytes
SHA-256: d12abd2c3230cbf0fec764da390d451a2fbb1337cbeda1e633cfc03648e3dc70
Detection
ClamAV: No threats found
Obfuscation or payload: likely
262 of 337 identifiers look randomly generated (e.g. 'yVsbaZsecJgKELtcZImWJSFGgNfoHeKVrIQxSAlE'); 4 string-concatenation chain(s) — consistent with name-mangling obfuscation.
embedded_file_obj0044.bin pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x3250 144 bytes
SHA-256: 3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169
embedded_file_obj0045.bin pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x32FD 77 bytes
SHA-256: 10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275

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