Malicious PDF — malware analysis report

Static analysis result for SHA-256 77452857f6fff605…

MALICIOUS

PDF

2.0 KB First seen: 2026-05-11
MD5: b837d2ff066fd4a7d141271b5e9a71b6 SHA-1: 866976118276e0bd80f0c461edb9b9256823100c SHA-256: 77452857f6fff605d704a968d935fbaebd03604fe202f7702c56e1e633f8b09c
128 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The critical heuristic firing for CVE-2010-0188 indicates that this PDF exploits an integer overflow vulnerability in Adobe Reader's XFA forms. The embedded TIFF image contains shellcode, which is typical for this exploit. The ML classifier also strongly flagged this PDF as malicious. The exploit likely leads to the execution of a second-stage payload, though no specific details of that payload were extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Adobe Reader XFA LibTIFF integer overflow — CVE-2010-0188 critical CVE exact CVE_2010_0188
    An XFA image field carries a TIFF whose IFD has a malformed tag that overflows the LibTIFF parser (CVE-2010-0188).
  • Suspicious extracted artifact medium 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 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
  • 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://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-template/2.4/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://ns.adobe.com/xtd/In PDF document text
    • http://www.xfa.org/schema/xfa-form/2.8/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x51 13386 bytes
SHA-256: be46ce8aa4542af89cd2ce0e2fde15a31939e6da286f3cff7d5cd0e2a2d3fcad
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
xfa_image_rawvalue_000.tif pdf-xfa-image-tiff XFA image/rawValue TIFF payload near offset 0x586 8610 bytes
SHA-256: 4927a269728acc0e0eb23fbc3e5d609942930b3757ce1a09730f327ac5290f4d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: heap spray 0x41 (A)

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