PDF malware analysis — malicious · ac434ad31517a87a

MALICIOUS

PDF

12.4 KB Created: 2011-02-08 15:19:47 Authoring application: zag wyn

MD5: 40a575560e9500c4e8e89658b5f83341 SHA-1: 9e4635109dbcaaf82e14208d4d42f4fe9c203d59 SHA-256: ac434ad31517a87ad1cb6ce14a4b507575c11f2cfb9fd4ab9a98266b1e14144e

178 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File Execution: Malicious File Execution

The PDF contains critical XFA heap spray exploit code and risky executable script within its XFA forms. The unescape() call and embedded script payload further indicate malicious intent. The primary attack vector appears to be the exploitation of a vulnerability within the XFA form processing, leading to the execution of a script that likely downloads and executes a second-stage payload, as suggested by the embedded file artifact.

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_obj0019.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0xC34	84 bytes
`embedded_file_obj0006.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0xCE5	228 bytes
`embedded_file_obj0007.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0xDD5	199 bytes
`embedded_file_obj0009.bin` `60887fa7231987749b17df24a437cfe7f40952fd6463e0c7deeabbfd02a1c00f`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0xEC5	119 bytes
`embedded_file_obj0017.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0xF7B	77 bytes
`embedded_file_obj0001.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x1021	56 bytes
`embedded_file_obj0013.bin` `eb1796e72691baebed0f14c509d58acf66ec2d69171a0e55a713b4928c431588`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x1359	11336 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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