PDF malware analysis — malicious · 3887dea89d1ad4cf

MALICIOUS

PDF

62.0 KB Created: 2012-06-11 17:19:01 Authoring application: Vvv

MD5: efe09e597b2f3b69b5b3e93da0713b30 SHA-1: a4699f6549ed040bc3addf7644f400ccacd2d943 SHA-256: 3887dea89d1ad4cfc26635139297adaefd9ac05c8c97f1349f7f34a0d52257bf

212 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains a high-risk XFA form with executable script content, flagged by multiple heuristics including ML and ClamAV detection as Pdf.Exploit.Dropped-97. The embedded JavaScript is likely responsible for exploiting a PDF vulnerability to download and execute a second-stage payload. The presence of an embedded script payload and XFA form indicates a malicious intent to compromise the user's system.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 10

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-97 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-97
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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/x
- http://�wt.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off0000031b.js` `9ea7487b4b82ab0cb763201fba3c3dd78bb2d29f1c455053525f24bd11ca3c02`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x31B	61787 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 base64-like blob(s).
`embedded_pdf_script_00000624.bin` `2d4ae666b657ff3d3946fcfc75104e4ca29dab1dd6a3a39d33e0bafbaac3790b`	pdf-embedded-script	PDF raw stream script payload at offset 0x624	62080 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 312 long base64-like blob(s).

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