PDF malware analysis — malicious · 8a583bc8e99acf71

MALICIOUS

PDF

276.3 KB

MD5: 4aafcdb3a23c350c6bb6a916591fa649 SHA-1: d59483bbfeb34ac898e5abcfdd7777fdb240bb0d SHA-256: 8a583bc8e99acf71aada2fa90b77e8a16cfc48bbfc33014dde1a23e3a04ce454

286 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript and a Flash object, indicated by PDF_JAVASCRIPT, PDF_JS, and PDF_RICHMEDIA heuristics. Critical findings like POLYGLOT_CHILD_PDF_STATIC_TRIAGE and CLAMAV_DETECTION confirm maliciousness. The embedded artifacts, including a secondary PDF and JavaScript file, suggest a multi-stage attack designed to download and execute further malicious content.

Heuristics 9

Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
ClamAV: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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 (matched inside decoded stream)
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
`zVGWPnPsl.swf` `ed760d4a2122e1bb79bf8530611e0b77f9d9223820e99fa56ae8c201f44862bc`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x146D	26774 bytes
Detection ClamAV: Pdf.Exploit.Agent-35955 Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `ce44f38eb0f616818628376bcec99247a88e161a69539f804a0484c5f0b1d586`	pdf-javascript-stream	PDF /JS object 6 at offset 0x13C	12116 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
`polyglot_child_pdf_off0003bf2a.pdf` `0f19ad8448c338b0c3e3a06c4476f0c3cd7e3195f52ddccef3899f2956be83ce`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x3BF2A	37419 bytes
Detection ClamAV: Pdf.Exploit.Agent-35955 Obfuscation or payload: unlikely

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