PDF malware analysis — malicious · 98fc5cfa0081b9c1

MALICIOUS

PDF

31.2 KB

MD5: d559d4ea763aee32ec5b2700aa53a8e7 SHA-1: 9d775bd1fcf6439ddb8bbf7616a713c621296187 SHA-256: 98fc5cfa0081b9c18d9b036e8698726d60e55fbd0966912db8e72a6c8b86ec12

106 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript and a Flash object (ZdhyXAVZwLWfPiH.swf), indicating a multi-stage attack. The JavaScript streams, particularly 'legacy_pdfkit_stage_000.js', likely contain obfuscated code designed to execute further malicious actions, such as downloading and running additional payloads. The presence of these embedded components and the high heuristic scores for JavaScript and RichMedia suggest a deliberate attempt to compromise the user's system.

Heuristics 6

RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
JavaScript action low 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
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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ZdhyXAVZwLWfPiH.swf` `767382813fc770c9716554c3266b22eee1636037ca964af05acf6ff66db4a27d`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x11C2	26993 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `b10c660af843d06dc4b5ecb55246a746ea87d709411d00fde7336556da740bed`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF9	3434 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `245d8359079e67fb785683031a40009f051bdef0cf056d90f42b8452503ffdc7`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0xDB1	2100 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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