PDF malware analysis — malicious · 990e92d270fcd893

MALICIOUS

PDF

17.7 KB Created: 2010-09-04 20:16:54 Authoring application: kobMums boorPea

MD5: 61b26f90aefed757b6b8b09e4221b6fa SHA-1: ef8b4023af7b090414a209bdea4120dd63935e13 SHA-256: 990e92d270fcd8939b313336b00a2a2d4a8f85a256352af0b736260d0363bc76

138 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.007 JavaScript/VBScript

The PDF sample contains XFA form elements with heap spray exploit code, indicated by the PDF_XFA_HEAP_SPRAY and PDF_XFA_SCRIPT heuristics. This suggests the file is designed to exploit a vulnerability in PDF viewers that support XFA forms, likely to download and execute a second-stage payload. An embedded file, 'embedded_file_obj0010.bin', was also detected, which may contain the secondary payload.

Heuristics 6

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.
XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY

PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
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
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 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 0xEE3	84 bytes
`embedded_file_obj0009.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0xF94	228 bytes
`embedded_file_obj0010.bin` `c4f491a91aded625833f12df701d0a26e4927138f854e0cffaa931026e5d20fe`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x1087	25398 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`embedded_file_obj0011.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x3E8F	199 bytes
`embedded_file_obj0012.bin` `9a2a4a8a0ee4653d3b4ee700d4438a80b321b4bf3cdab2e745c128c632ff6d33`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x3F80	131 bytes
`embedded_file_obj0013.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x403D	77 bytes
`embedded_file_obj0014.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x40E4	56 bytes

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