Malicious PDF — malware analysis report

Static analysis result for SHA-256 5396dc7dc15e306b…

MALICIOUS

PDF

4.4 KB
MD5: a0be7e5b9bb4d39ae6489be3de34cf12 SHA-1: 4f868325c33997124684ba43c531b6c416a35f5b SHA-256: 5396dc7dc15e306b53044ac60bbce237fca057cb25effcec7d5c4e74b699d35a
152 Risk Score

Malware Insights

The PDF file contains embedded JavaScript and triggers a critical heuristic for CVE-2010-0188, indicating an exploit targeting Adobe Reader's LibTIFF component. The embedded JavaScript, specifically the eval() call and String.fromCharCode usage, is characteristic of exploit delivery mechanisms. This suggests the document is designed to download and execute a second-stage payload upon opening in a vulnerable reader.

Heuristics 10

  • Adobe Reader LibTIFF XFA image exploit — CVE-2010-0188 critical CVE likely CVE_2010_0188
    PDF contains XFA image data with an inline crafted TIFF payload and shellcode/delivery markers. This is the data-bound variant of the CVE-2010-0188 Adobe Reader LibTIFF/XFA exploit shape.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • 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.
  • 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.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
f6dc01e7a352c109b0933f1e2e6006d05f8961f12b9f860ee49e6d9ca3ad09e9		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x52 13330 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
javascript_obj0007_000.js
3b6ce2451c02beb6164ac8959b6c9d31514da75addb78fcdc0adc66147a5656b		 pdf-javascript-stream PDF /JS object 7 at offset 0x8AA 109 bytes

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