PDF malware analysis — malicious · 1a5e3343867ed2f9

MALICIOUS

PDF

15.3 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap

MD5: 98279dc0da6f207040d5d59139f72827 SHA-1: 52f22787879da083fb4c46f5bd0b3621771697d4 SHA-256: 1a5e3343867ed2f916b50337cc72d5a92183e896ad567c7a06d5d49db1ec9661

208 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1105 Ingress Tool Transfer

This PDF file was flagged as malicious by ClamAV with the signature 'Pdf.Exploit.Dropped-81'. High-severity heuristics indicate the presence of XFA forms containing executable scripts and an eval() call, suggesting an exploit is being leveraged. The file also contains embedded artifacts, one of which is significantly larger and likely contains the secondary payload. The primary attack pattern involves exploiting a PDF vulnerability to download and execute a malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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.
ClamAV: Pdf.Exploit.Dropped-81 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-81
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
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://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/1.0/
- http://www.xfa.org/schema/xfa-template/2.5/
- http://ns.adobe.com/xtd/
- http://www.xfa.org/schema/xfa-data/1.0/
- http://ns.adobe.com/xfdf/
- http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `04462f810d6eacdacecc9d0a5f3f81bebc722af4415e04da19b520338f642b51`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xDB	67 bytes
`embedded_file_obj0010.bin` `5f70b878e3d54dde19570d8a7ff0baeaff8a890ed05f630bed70eb78cbc4a245`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x168	779 bytes
`embedded_file_obj0011.bin` `f6cf9d66c9a70ca50aac6ec39da3dd40c41504f3a1b6836cac05690e41e8c3f2`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x4BE	477 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0012.bin` `103d1e7983cf88bfacedddb4af33ffb5317d9c2c8b3e1bfd987b2c5d712bc985`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x6E6	323 bytes
`embedded_file_obj0014.bin` `cc25362d5d14f2e155ec7c9a64f3a35a284b92b8f185a1f5375d85997fa48591`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x873	12263 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0015.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x38A0	77 bytes
`embedded_file_obj0016.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x3934	56 bytes

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