PDF malware analysis — malicious · 8ff406263af143db

MALICIOUS

PDF

13.8 KB Created: 2010-09-15 17:01:56 Authoring application: day oho

MD5: a9d1aeeb90d57c9a146ddf17caae5a7e SHA-1: bb4b6a326a6917c2a3e296501eef4af098cfeee1 SHA-256: 8ff406263af143dbb8d550ce5f7ef3eb180e2a9f2ad234ed26998c023868bd35

178 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1059.007 Command and Scripting Interpreter: JavaScript

The PDF sample contains critical XFA JavaScript heap spray exploit code, indicated by the PDF_XFA_HEAP_SPRAY and PDF_XFA_SCRIPT heuristics. This exploit code is designed to download and execute a second-stage payload, likely contained within the embedded file object 'embedded_file_obj0001.bin'. The presence of unescape() calls and embedded scripts further supports the malicious intent.

Heuristics 7

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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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
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_obj0015.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xAE7	84 bytes
`embedded_file_obj0011.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0xB99	228 bytes
`embedded_file_obj0013.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0xC8A	199 bytes
`embedded_file_obj0010.bin` `1f627c71d65710ddfa486ef380a0335aa66ca44085ab5c46c9d004f5d10cfe65`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0xD7B	119 bytes
`embedded_file_obj0019.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0xE33	77 bytes
`embedded_file_obj0006.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0xED9	56 bytes
`embedded_file_obj0001.bin` `58c4c9a54c4edb1aad6283382e74422208f305172ea12307c639db5149cb2c41`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x1213	24873 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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