PDF malware analysis — malicious · cbf6e9ef98495f79

MALICIOUS

PDF

7.5 KB

MD5: 2cd805e4a9e99fa61b131bd5bf361c32 SHA-1: b6fa94495a33b38d92fc1efba3b9472defcd5413 SHA-256: cbf6e9ef98495f799e787f9b92a20a37322df17b09ae8d1eeabc08399dd51f51

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Attachment

The PDF contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_UNESCAPE'. The 'CLAMAV_DETECTION' heuristic further confirms its malicious nature. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is the primary mechanism for delivering the malicious payload, likely by downloading and executing a second-stage artifact. The presence of JBIG2 decoding with active content suggests attempts to hide or embed malicious data within the PDF structure.

Heuristics 7

JBIG2 + active content high CVE related PDF_JBIG2_ACTIVE_CONTENT

JBIG2Decode appears with JavaScript/XFA/RichMedia — a related indicator for JBIG2 parser-exploit families including CVE-2021-30860 and CVE-2009-0658, but not a unique CVE fingerprint.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
JBIG2Decode filter medium PDF_JBIG2

JBIG2 image decoder present — historically used in zero-click exploits
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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `93c80667bc73a57dd697cca4f540eb991e6d1cc7949ebe8e1c7ddbff40cb7ca2`	pdf-javascript-stream	PDF /JS object 6 at offset 0x21D	6093 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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