PDF malware analysis — malicious · e88f6df1d13ba3d1

MALICIOUS

PDF

13.5 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap

MD5: 46de6b6baffbf63714c0f3b64522df8f SHA-1: c0ea17757b5188f628bc84a3415094d894a91e6f SHA-256: e88f6df1d13ba3d1cfb0a972ab9bd119771032a6e2041c8be1a574efb45764a1

148 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

This PDF file exhibits multiple high-severity heuristics indicating it contains embedded executable scripts within an XFA form, a known vector for exploitation. The ClamAV detection 'Pdf.Exploit.Dropped-81' strongly suggests the presence of a malicious payload. The embedded script is likely responsible for downloading and executing a secondary stage, as indicated by the 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic flagging obfuscated script indicators and an embedded file. The document body is unreadable, but the technical indicators point to a malicious exploit delivery mechanism.

Heuristics 9

XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT

PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
ClamAV: Pdf.Exploit.Dropped-81 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-81
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
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. (matched inside decoded stream)
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. 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.
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/xci/1.0/
- http://ns.adobe.com/xtd/
- http://www.xfa.org/schema/xfa-data/1.0/
- http://ns.adobe.com/xfdf/
- http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0006.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0x21C	84 bytes
`embedded_file_obj0007.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x2BE	228 bytes
`embedded_file_obj0008.bin` `02579fba79bcd097048416dd041ca8ad13d642834f3576c20f83b060116410c1`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x3FA	1102 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0009.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x6F2	199 bytes
`embedded_file_obj0010.bin` `a6c920555dc8456365d2dbb34d5a39aadafa56ae2cde1d55c5356e043e5faa9a`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x80A	10445 bytes
`embedded_file_obj0011.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x3125	77 bytes
`embedded_file_obj0012.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x31C0	56 bytes

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