PDF malware analysis — malicious · a0566da2383f136f

MALICIOUS

PDF

12.6 KB Created: 2010-12-27 07:10:14 Authoring application: ser ewe

MD5: 1f2494a21a3093fcb338c822ae8fb790 SHA-1: b2dbc52b81726fb8992c87a2ec2b4289db02a7f7 SHA-256: a0566da2383f136f9fd170ba0dfb0b36590465cd34a5fe4fb87132c5ccf0a60b

208 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File

The PDF sample contains critical XFA heap spray exploit code and embedded script payloads. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be the exploitation of XFA forms via a heap spray, which is designed to execute arbitrary code. This code likely serves to download and execute a secondary payload from the embedded file 'embedded_file_obj0013.bin'.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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_obj0016.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xBE2	84 bytes
`embedded_file_obj0018.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0xC94	228 bytes
`embedded_file_obj0017.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0xD85	199 bytes
`embedded_file_obj0001.bin` `c0dda71f369fa82798c4ee6bd1c61c072cdabd830247df33ce171c86b952333f`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0xE75	119 bytes
`embedded_file_obj0019.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0xF2D	77 bytes
`embedded_file_obj0015.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xFD4	56 bytes
`embedded_file_obj0013.bin` `63dbaf96a1f3dd07853840b2feae36f7e0f3082b1582dece5358a97ed074b9f1`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x130D	11850 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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