PDF malware analysis — malicious · 4d4c800fcc20838d

MALICIOUS

PDF

17.2 KB Created: 2010-08-29 16:19:36 Authoring application: Betuhvcxquki Yltnoooifbgcld

MD5: 3767ac73543887f34ca02b5050975031 SHA-1: 379a85cd3ce671cfe9bb4801f9178edf9990cc7f SHA-256: 4d4c800fcc20838db63d165bda0e9e974de4cf8436804a70aaaeebaab5736502

186 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

This PDF file contains embedded scripts and is flagged by multiple heuristics, including ML classification and ClamAV detection as 'Pdf.Exploit.Dropped-81'. The embedded script utilizes eval() and string concatenation to reconstruct a URL, which is then used to download an executable file. The primary intent appears to be the execution of a second-stage payload from the identified URL.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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.
Suspicious extracted artifact medium 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 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
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://67.209.224.57/f.exe?&quot
- http://ns.adobe.com/xfdf/
- http://www.xfa.org/schema/xfa-data/1.0/
- http://ns.adobe.com/xdp/
- http://ns.adobe.com/xtd/
- http://www.xfa.org/schema/xci/1.0/
- http://www.xfa.org/schema/xfa-template/2.5/
- http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0015.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x42	77 bytes
`embedded_file_obj0014.bin` `c929bc43094fe46b69e09762335deeb6741254c91fd044835cac59cf7c8f884a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x436	151 bytes
`embedded_file_obj0010.bin` `13fce9eff375d9624a4d3153de2a4fe4aa6075f5a66a5f9d0deddeb9e5537ee6`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x512	562 bytes
`embedded_file_obj0008.bin` `04462f810d6eacdacecc9d0a5f3f81bebc722af4415e04da19b520338f642b51`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x82D	67 bytes
`embedded_file_obj0012.bin` `a5bffafabc1888cfb6bd349380f7cb66d97de140705778ab94fc6814a3c0b3fe`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x915	382 bytes
`embedded_file_obj0009.bin` `f71de64fbd4d5df8c59e5f3a6eb6c0ec2b6f82cf369f26f15812ace2276ca475`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0xAD7	292 bytes
`embedded_file_obj0011.bin` `c260e6e2e7f6eec7b525d9070eb8d0d978be75d75713436f6d3a8a4a62c1926a`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0xC40	14216 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
`embedded_file_obj0016.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x440D	56 bytes

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