PDF malware analysis — malicious · e38f216c4735c19f

MALICIOUS

PDF

8.7 KB

MD5: 97f145923a589fca7e564bce55757e50 SHA-1: 58fb95710ec282d3a1d66853bcfbdc5bebd99b1a SHA-256: e38f216c4735c19fbd9f32705ae240d3f5cbb8b64105d36cdc180d3b5c5040a7

174 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious PDF T1059.001 PowerShell

This PDF sample utilizes an XFA form with a heap spray exploit, indicated by the 'PDF_XFA_HEAP_SPRAY' and 'PDF_XFA_SCRIPT' heuristic firings. The exploit code is embedded within a decompressed stream, suggesting an attempt to execute arbitrary code upon opening the document. The presence of an embedded URL, though benign in reputation, is suspicious in context. The ML classifier strongly flags this PDF as malicious. The primary attack vector appears to be leveraging XFA vulnerabilities for code execution.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
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
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://www.xfa.org/schema/xfa-locale-set/2.1/

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0041.bin` `c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0xE93	85 bytes
`embedded_file_obj0042.bin` `dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91`	pdf-embedded-file	PDF EmbeddedFile object 42 at offset 0xF45	1029 bytes
`embedded_file_obj99999.bin` `7c7af741ca2e2d83aad7e79caa0aef8b915f49e7d66287467b91e85efad20a32`	pdf-embedded-file	PDF EmbeddedFile object 99999 at offset 0x1161	22980 bytes
`embedded_file_obj0044.bin` `3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169`	pdf-embedded-file	PDF EmbeddedFile object 44 at offset 0x1D2E	144 bytes
`embedded_file_obj0045.bin` `10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275`	pdf-embedded-file	PDF EmbeddedFile object 45 at offset 0x1DDB	77 bytes

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