PDF malware analysis — malicious · 50ad06523a341871

MALICIOUS

PDF

12.2 KB Created: 2011-01-08 12:12:51 Authoring application: pus lie

MD5: da07dac57e2b93e929ebb64c39a190e0 SHA-1: d600f53bd718860e5dce8a85caa7069904c57edb SHA-256: 50ad06523a3418714243721d337f70058d30b530f4551eaed9654a479ae80616

208 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The sample is a PDF file that exhibits critical heuristic firings for XFA heap spray and embedded script payloads. The ML classifier strongly indicates maliciousness. The presence of XFA JavaScript heap-spray exploit code suggests the document is designed to exploit a vulnerability in PDF rendering engines to achieve code execution. The embedded file 'embedded_file_obj0006.bin' is likely the secondary payload.

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_obj0009.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0xB67	84 bytes
`embedded_file_obj0015.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xC19	228 bytes
`embedded_file_obj0011.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0xD0A	199 bytes
`embedded_file_obj0007.bin` `4d38ea027ea6fc4571ee2eb291a0a2e73efeb13c795e7b642c5a826c7bb813ad`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0xDFA	119 bytes
`embedded_file_obj0010.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0xEB2	77 bytes
`embedded_file_obj0003.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0xF58	56 bytes
`embedded_file_obj0006.bin` `67bab250db658de820cf10829e027369c48dc69ab6b472f88dce07b6a5952b52`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0x128E	11434 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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