PDF malware analysis — malicious · 3de3572e08bde89b

MALICIOUS

PDF

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

MD5: 49292f080298b54ac7407ab54190ead1 SHA-1: bfa943a02e22cee61351167f55a79b6569a9f842 SHA-256: 3de3572e08bde89b1d2bb81f193c750d5cbb5bd600a55da5e3c81e4286aadd9f

186 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1059.001 PowerShell: Command and Scripting Interpreter T1105 Ingress Tool Transfer

The sample is a PDF file exhibiting multiple high-severity heuristics related to XFA forms and embedded script payloads. The ClamAV detection 'Pdf.Exploit.Dropped-81' strongly suggests a known exploit. The presence of embedded files and the PDF_EVAL heuristic indicate that the document is designed to execute code, likely to download and run a secondary malicious payload. The specific URLs extracted are related to XFA schema definitions and are not directly indicative of malicious infrastructure, but their presence within the context of exploit heuristics is noted.

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
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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)
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://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_obj0008.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xDB	84 bytes
`embedded_file_obj0009.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x176	228 bytes
`embedded_file_obj0010.bin` `53f73a9d0a94025903818f9ef999b663237f79d32585ff4175f0fbbab2ed0aea`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x2B8	973 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0011.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x532	199 bytes
`embedded_file_obj0012.bin` `3b396dbd21eda7f482b7abc6c3da1c2474d10fceb2a9ef4a654ec7ad60ff9a7a`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x624	34585 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0013.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x414F	77 bytes
`embedded_file_obj0014.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x41E2	56 bytes

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