PDF malware analysis — malicious · 36bac99307f05380

MALICIOUS

PDF

14.2 KB Created: 2010-09-06 16:18:04 Authoring application: yar toe

MD5: a39b42b2ac881afd1dde8fc584ad86b0 SHA-1: 7b428db3a0355b50889984261e321a009aeae5da SHA-256: 36bac99307f053808dcb53adbf74e7d4d7160ac44c545dfabd643cd385c05831

178 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1059.001 Command and Scripting Interpreter: PowerShell

The PDF sample contains critical XFA heap spray exploit code, indicated by the PDF_XFA_HEAP_SPRAY heuristic. This exploit is designed to execute arbitrary code, likely to download and run a second-stage payload. The presence of embedded files, including a larger one named embedded_file_obj0009.bin, suggests it acts as a dropper for further malicious activity.

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_obj0013.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0xA5B	84 bytes
`embedded_file_obj0018.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0xB0D	228 bytes
`embedded_file_obj0007.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0xBFD	199 bytes
`embedded_file_obj0008.bin` `46fd7d8f665ab18b15a271ed56250d6cdafef14604ad659e9dddfabe2a0f268b`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xCED	119 bytes
`embedded_file_obj0010.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0xDA5	77 bytes
`embedded_file_obj0005.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0xE4B	56 bytes
`embedded_file_obj0009.bin` `0ec81189aa1870c76f5938eb9b15a7374599a87c04ec1598ed76a4afe1d4938a`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x1186	16214 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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