PDF malware analysis — malicious · b629a2c3970dcf63

MALICIOUS

PDF

29.3 KB

MD5: aa4ee123f7f115b67035462a8488e2d2 SHA-1: 0331e1705b3eea422d906292ee61b486bd49c0e5 SHA-256: b629a2c3970dcf635f5c210bf5f1b46da599f74e399cff09a4b0af4fea4310bb

274 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript that utilizes `eval()` and `unescape()` functions, indicating obfuscated code execution. The JavaScript is likely responsible for loading the embedded SWF (Flash) file, which is a known vector for exploit delivery. The presence of `String.fromCharCode` further supports the obfuscation and dynamic code generation. The ClamAV detections 'Pdf.Exploit.Agent-36098' and 'Pdf.Exploit.Agent-35955' on the main file and an extracted artifact respectively, confirm the malicious nature of this document.

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 0xC3D	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 0x841	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` `8de77cdb99b963495b8aeffc6aa4992974ca860c0f4bb1045ffb32c19bfea191`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x64	3488 bytes

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