PDF malware analysis — malicious · ec6632372242d7de

MALICIOUS

PDF

16.7 KB Created: 2010-08-29 16:19:36 Authoring application: Rlrnxvwmwln Aucdegnelmdli

MD5: a4fbb7ace75be2ba519f5b4698571d81 SHA-1: d5d37a9d851261a75b138dc3ff5f4b1dcfa01789 SHA-256: ec6632372242d7ded508ca2ebb179b00916322c8b6d87cb32f4c55c08eed03e1

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF document exhibits high-confidence maliciousness due to a critical ClamAV detection (Pdf.Exploit.Dropped-81) and a high-severity heuristic firing for PDF_EVAL, indicating the execution of arbitrary code. The presence of an embedded script payload and an embedded file further supports this. The ML classifier also flagged this PDF with a very high probability of being malicious. The embedded script likely attempts to download and execute a second-stage payload, as suggested by the embedded file artifact.

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.
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://www.xfa.org/schema/xfa-form/2.8/
- http://ns.adobe.com/xtd/
- http://ns.adobe.com/xdp/
- http://ns.adobe.com/xfdf/
- http://www.xfa.org/schema/xfa-data/1.0/
- http://www.xfa.org/schema/xci/1.0/
- http://www.xfa.org/schema/xfa-template/2.5/

Extracted artifacts 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0016.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x42	56 bytes
`embedded_file_obj0011.bin` `37d9f129b501b923c95db6f559e448ece9939b19bfc1aa9493e4b6e224848859`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0xBF	13783 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0012.bin` `a5bffafabc1888cfb6bd349380f7cb66d97de140705778ab94fc6814a3c0b3fe`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x3825	382 bytes
`embedded_file_obj0010.bin` `48accef6266b510f1a0befc4a045839f6a2de781dfd39a1f971f8764401c45ed`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x3A37	557 bytes
`embedded_file_obj0008.bin` `04462f810d6eacdacecc9d0a5f3f81bebc722af4415e04da19b520338f642b51`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x3DEA	67 bytes
`embedded_file_obj0015.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x3EEB	77 bytes
`embedded_file_obj0014.bin` `e511140503c6d676854dafbefe0e479ab16532d6c85373639ff2f4eee6ecbece`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x3F7D	140 bytes
`embedded_file_obj0009.bin` `f71de64fbd4d5df8c59e5f3a6eb6c0ec2b6f82cf369f26f15812ace2276ca475`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x404D	292 bytes

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