PDF malware analysis — malicious · 99e0bae3430c95ea

MALICIOUS

PDF

21.2 KB Created: 2010-08-12 12:30:15 Authoring application: pimpOps wynBunk

MD5: e18ef281ceb9f33f412c85c864c82caa SHA-1: 3778bc28d79026136b0e3a3a8190d9fe3a4fce15 SHA-256: 99e0bae3430c95eacd5aa954f68c38870e94111544a7e9c7d5ab7a121f817e61

170 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1566.001 Phishing: Spearphishing Attachment

The PDF sample contains critical XFA JavaScript heap spray exploit code, indicating an attempt to execute arbitrary code upon opening. The presence of embedded script payloads and a high ML classifier score further support its malicious nature. The primary attack vector appears to be a malicious PDF document delivered as an attachment, aiming to exploit a known vulnerability.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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 0x1732	84 bytes
`embedded_file_obj0009.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x17E3	228 bytes
`embedded_file_obj0010.bin` `59ade7ee41ee0702bed525d23d0a2eea55d3519511cfc38b11a06d27b7533d4b`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x18D6	28103 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 0x4C5E	199 bytes
`embedded_file_obj0012.bin` `586c8748aaa30d934720c13021cd167675cfbc86df48ba4922830f1159fa335d`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x4D50	131 bytes
`embedded_file_obj0013.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x4E11	77 bytes
`embedded_file_obj0014.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x4EB8	56 bytes

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