PDF malware analysis — malicious · 43f51ae5b02a74c8

MALICIOUS

PDF

24.6 KB Created: 2010-09-10 02:11:18 Authoring application: Scribus 1.3.3.14 (via Scribus PDF Library 1.3.3.14) First seen: 2026-05-08

MD5: 7101f699895814dc061822b8e2fe893e SHA-1: 312ced68b27fd1f9199c07028e4975709f3f82b4 SHA-256: 43f51ae5b02a74c88eb1a1221f8a4bc1b30f5363523a6588c1ae0f16d97c152f

92 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF exhibits multiple indicators of malicious intent, including embedded JavaScript and an embedded file. The presence of ASCII85Decode filters and AcroForm buttons with actions further suggests an attempt to obfuscate or trigger malicious code execution. The embedded file, 'embedded_file_obj0021.bin', is a primary indicator of a potential secondary payload delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 10

JavaScript action low 1 related finding PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (identified after nested-decoder de-obfuscation)
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. 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/xdp/ In PDF document text
- http://www.xfa.org/schema/xci/1.0/In PDF document text
- http://www.xfa.org/schema/xfa-template/2.4/In PDF document text
- http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
- http://ns.adobe.com/xtd/In PDF document text
- http://www.xfa.org/schema/xfa-form/2.8/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0021.bin`	pdf-embedded-file	PDF EmbeddedFile object 21 at offset 0x5873	13430 bytes
SHA-256: `0309db5850dea096d566c8ed55dab6d656854b8b97c501a4ba94a0df94dbb272`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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PDF

Malware Insights

Machine Learning

Heuristics 10

Related samples 6

Extracted artifacts 1