Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1544f2b186843e8…

MALICIOUS

PDF

19.4 KB
MD5: 7ce5874c13159cdccda576e98d078118 SHA-1: ce3c809b0cc506bc6873ff6249fc1071a09b2cb6 SHA-256: a1544f2b186843e81a0360f9546786d54109bffebfa5f9a90dac00c0e575681d
98 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.001 PowerShell

The file is identified as malicious by ClamAV with the signature Pdf.Exploit.Dropped-78, indicating it's a known PDF exploit. The presence of an embedded script payload and an embedded file further supports this. The script content, though obfuscated, suggests an attempt to execute validation routines and potentially download or execute a second-stage payload, which is a common attack pattern for PDF exploits. The embedded URLs are likely related to the exploit or payload delivery.

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
4d0923e6b6899670fc43e25e4224d2d1d878f64815c8375f6d9361fd9ecde250		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 19055 bytes

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