PDF malware analysis — malicious · 0616c019790aab2c

MALICIOUS

PDF

66.8 KB

MD5: 2f1ac7bed6bf77c2bc3aa08b044b754c SHA-1: 21d42d9029998919b8d370f1d0f35a8cf86515f8 SHA-256: 0616c019790aab2c984edc7293b191b0afcd566cde47827ce92e8c78f4cc77cc

224 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and is encrypted, with an OpenAction pointing to hidden content. This strongly suggests an attempt to conceal a malicious payload, likely a second-stage exploit or downloader, which is a common technique for initial access via spearphishing attachments. The embedded artifact 'enc.pdf' is also suspicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9495

Heuristics 8

Embedded PDF child has suspicious static findings critical PDF_EMBEDDED_CHILD_STATIC_TRIAGE

PDF contains an embedded PDF stream whose extracted child matches suspicious or malicious PDF heuristics. Wrapper PDFs are commonly used to hide the actual exploit or lure payload from scanners that do not recursively inspect attachments.
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
Encrypted PDF carries /OpenAction — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS

PDF declares /Encrypt and also references an executable trigger (/OpenAction). 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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
Remote GoTo action info PDF_GOTO_REMOTE

PDF has GoToR/GoToE actions that reference sibling document files — typical of multi-part document bundles

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`enc.pdf` `b8a24313dbe372565df50c09a266eeb2a474fce7cc1dec158448c4c437024996`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x2F5	68148 bytes
`objstm_0002_00.bin` `6565c85865437da0f996ff5694aa9f9003c007921da4a9107aa1facd25f3f895`	pdf-objstm-decoded	PDF /ObjStm 2 0 obj (inflated)	553 bytes

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