PDF malware analysis — malicious · a791cdb927705cb3

MALICIOUS

PDF

7.9 KB

MD5: d917a9054b608b62c401c93c538b9f59 SHA-1: 0abaa8519651c3a337b22ed1a57b280687b62e02 SHA-256: a791cdb927705cb3b17573e3acb2cb072c2fe3f0642156fbc1ba9f71b33a0808

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The critical ClamAV detection and high-severity heuristic for an 'Obfuscated multi-stage PDF JavaScript dropper' indicate a malicious PDF. The embedded JavaScript, particularly the 'deobfuscated.js' artifact, is responsible for decoding and executing a secondary payload. The obfuscation techniques and multi-stage nature suggest a downloader designed to fetch and run further malicious content. The specific ClamAV signature 'Pdf.Exploit.Agent-35902' is the primary IOC.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-35902 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35902
Obfuscated multi-stage PDF JavaScript dropper high PDF_JS_OBFUSCATED_DROPPER

PDF JavaScript shows 5 independent signals of exploit-kit-style multi-stage obfuscation: annot_subject_stage, hex_codec_loop, hex_dashed_payload, incremental_eval_build, 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.
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)
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` `3cf6a22459cda11e607fc9e0dc0c88d01a8425e26488ff87df38d855ceb4dccf`	pdf-javascript-stream	PDF /JS object 5 at offset 0x148	465 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `34ce8b4c11cf7a271277be6f9092ee464ed76663a55242f98f23d28745a726c3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1A97	1660 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`deobfuscated.js` `eb9a345fdca6c7b186d73e404ef0ceccb7dae0e88cf714e865ef98aaa720a348`	deobfuscated-js	PDF JavaScript deobfuscation pass	22864 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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