PDF malware analysis — malicious · ddfd5c88feae3659

MALICIOUS

PDF

16.3 KB

MD5: 4bbbc575c555a291911996715ea59caf SHA-1: 714daaae2a22f41888612d60a888c3ed3f9e2210 SHA-256: ddfd5c88feae3659283011c2fa392379f768ad2e7ba36f802377fb292eccc803

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains obfuscated JavaScript, identified by the 'PDF_JS_OBFUSCATED_ செறிவு' heuristic. This script is designed to act as a dropper, likely downloading and executing a second-stage payload. The ClamAV detection 'Pdf.Exploit.Agent-22472' further confirms its malicious nature. The presence of multiple JavaScript streams and deobfuscated JS files indicates a multi-stage attack.

Heuristics 6

ClamAV: Pdf.Exploit.Agent-22472 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-22472
Obfuscated multi-stage PDF JavaScript dropper high PDF_JS_OBFUSCATED_DROPPER

PDF JavaScript shows 3 independent signals of exploit-kit-style multi-stage obfuscation: annot_subject_stage, hex_dashed_payload, repeated_pluginschk. This is strongly consistent with pre-2011 Adobe Reader PDF droppers — OpenAction JS reads encoded data from annotation subjects, decodes it through one or more hex / base-N loops, and invokes eval indirectly (method name built one character at a time). The actual CVE is hidden in the final decoded layer and is not visible via static analysis.
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed 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
`javascript_obj0005_000.js` `8c65bfb370d7bf87a49e768ed4d0b37b1abeed6b76c218597f0d1aa4b71efd8a`	pdf-javascript-stream	PDF /JS object 5 at offset 0x148	720 bytes
`legacy_pdfkit_stage_000.js` `4d3508c7dbca10009f3ff2d49bda3a976842951ae0e69ccde69e60e0a9c72e12`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1BC4	12925 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `dd5959ced99c198dfb9d24d7d8564185f7365db4931eeb8a80c6a8215c6f5ae0`	deobfuscated-js	PDF JavaScript deobfuscation pass	63243 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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