PDF malware analysis — malicious · e56b55a2784db257

MALICIOUS

PDF

29.3 KB

MD5: b70a762f26aa392dc7cb5f70f65c00d7 SHA-1: 164792d28e8b21e3ef421280824fd03de1f9539f SHA-256: e56b55a2784db257753a5309e7c1d081af7601ff465edc733aeb8f22c4a37031

274 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, PDF_RICHMEDIA, and EXTRACTED_FILE_STATIC_TRIAGE heuristics. The JavaScript stream utilizes eval() and unescape() functions, suggesting obfuscation to hide malicious code. ClamAV detections for 'Pdf.Exploit.Agent-36098' and 'Pdf.Exploit.Agent-35955' on the main file and an extracted artifact respectively, confirm malicious intent. The primary function of the embedded scripts appears to be the execution of the SWFNAME.swf file, likely as a secondary stage for payload delivery.

Heuristics 10

ClamAV: Pdf.Exploit.Agent-36098 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36098
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)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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
`SWFNAME.swf` `a98024b4ee1377e872e3ebaf1c361600c270db5fd5ba79f256106c0c566dde29`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xC44	26777 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` `e1ab3bbf30605cecdce6db9d2556198626dbb178f7a4cb471a9436bb6e8bd92f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x848	462 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `b786a43036be24d1e8f3b397e9194a055328a6aa1576bb89ef9dc68f00eb8fb4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x64	3500 bytes

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