PDF malware analysis — malicious · 278f34d235e46b73

MALICIOUS

PDF

2.40 MB Created: -fºøýDil1ñ9Fÿ<\@ Authoring application: þp4î¥2>.mV¨J>û:BWÅä (via þp4î0{mS´A{ï <) First seen: 2026-05-10

MD5: 584c0839840188a964981c737c394767 SHA-1: 1565e7d61e9bcaa0abb0fa5dbbeccbedc48d67f2 SHA-256: 278f34d235e46b73c2c693619da4f528b6e5817a75a4e6b97a8f01f387144a7f

576 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.001 User Execution: Malicious Link T1027 Obfuscated Files or Information T1140 Deobfuscate/Decode Files or Information

The PDF contains embedded JavaScript and an embedded executable file masquerading as a PDF. The critical heuristic PDF_LAUNCH_COMMAND indicates that cmd.exe is launched with parameters designed to execute the embedded payload, which is named 'sakerhetspolisen2009webb.pdf'. This chain of actions, combined with the ClamAV detection, strongly suggests a malicious intent to deliver an executable payload to the user.

Machine Learning

Nyx PDF Classifier malicious score 0.9556

Heuristics 13

Adobe Reader Launch action command execution critical CVE exact CVE_2010_1240

PDF uses the Adobe Reader/Acrobat Launch action pattern associated with CVE-2010-1240: cmd.exe is invoked with attacker-controlled parameters, paired with an embedded/exported payload.
ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Tool.Agent-1388586
Launch action critical PDF_LAUNCH

PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD

PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
/Launch action target: cmd.exe critical PDF_LAUNCH_COMMAND

PDF /Launch action specifies an executable target with parameters '/Q /C %HOMEDRIVE%&cd %HOMEPATH%&(if exist "Desktop\\sakerhetspolisen2009webb.pdf" (cd "Desktop"' — references a known-dangerous executable (cmd, PowerShell, etc.).
Embedded attachment masquerades: declared document, content is windows-executable critical PDF_EMBEDDED_FILESPEC_CONTENT_MISMATCH

An /EmbeddedFile attachment's declared filename extension or /Subtype MIME type contradicts the magic bytes of its decompressed content. The attachment is declared as a benign document or image but the bytes are an executable or executable-bearing archive. This is a deliberate deception used to hide droppers in PDF attachments and is a generic indicator of embed-and-drop weaponisation, independent of any specific CVE.
Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS

PDF declares /Encrypt and also references an executable trigger (/JavaScript). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
/Launch action paired with attachment-dropping JS API high PDF_LAUNCH_PLUS_DROPPER_JS

PDF combines a /Launch action with a JavaScript API call that writes or opens an attached/external resource — the canonical shape of the CVE-2010-1240 /Launch + exportDataObject family. Benign PDFs do not pair these surfaces; the combination indicates a drop-and-execute chain regardless of the specific JS API knobs or /Launch target.
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.
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
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.zeustech.net/ In PDF document text
- http://]hostname[:port]/pathIn PDF document text
- http://www.apache.org/In PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`sakerhetspolisen2009webb.pdf`	pdf-embedded-file	PDF EmbeddedFile object 24 at offset 0x4FC12	73802 bytes
SHA-256: `badd2a812340d36397f643f9125569cbcca1e53f9b3353688dac6f7a6ba48735`
Detection ClamAV: Win.Trojan.Swrort-5710536-0 Obfuscation or payload: likely actual_type=PE; declared_or_context_type=PDF; filename=sakerhetspolisen2009webb.pdf; kind=pdf-embedded-file Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS, SC_MSF_BIND, SC_PUSH_STRING Static shellcode analysis recovered API/import strings: kernel32.dll, advapi32.dll, KERNEL32.DLL, ADVAPI32.DLL, LoadLibraryA, GetProcAddress
`javascript_obj0005_000.js`	pdf-javascript-stream	PDF /JS object 5 at offset 0x4F46D	73 bytes
SHA-256: `7bf228077d558af84b081c12440853cd927f3dc8d9759c19681222218c756fd4`
Preview script First 1,000 lines of the extracted script this.exportDataObject({ cName: "sakerhetspolisen2009webb", nLaunch: 0 });
`stream_001_off0006c0f7.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x6C0F7	93740 bytes
SHA-256: `255a6b7f7914f10db983c9d48b475887df0ac7515b38076d5ec422ca1d25b614`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`stream_002_off000d0147.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xD0147	67796 bytes
SHA-256: `81b2e55ee7b677cc6054fd4faa16393c017a4af4b5bcc901ab4a3aabe7939aeb`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`stream_018_off0022742c.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x22742C	4498 bytes
SHA-256: `5e7af2f43f3d690a09591f66715fcefe15ccaab1b899d399aa25e8d02f341505`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.
`stream_031_off00235c52.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x235C52	7453 bytes
SHA-256: `095201d8a5f3838f081c930183274692d4d9728a27c7acf0fe72952dd6f1927c`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.
`stream_043_off00247354.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x247354	4710 bytes
SHA-256: `8a196a4abd5fdf84e8e671b63fe5f16465a63c5ba9c78cca6a24d9a9ca626f6c`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.

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Malware Insights

Machine Learning

Heuristics 13

Related samples 8

Extracted artifacts 7