PDF malware analysis — malicious · 1d4f7d657437e03e

MALICIOUS

PDF

15.8 KB

MD5: 52b9f70ab7fe484f5b23eac48cfec288 SHA-1: 28f438ee921be2cddebc06d21157f62bbc39a3f2 SHA-256: 1d4f7d657437e03e070f36838ff735e2f4c5fe62494a1b0601f99383e9a4b966

126 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 malicious intent. The embedded JavaScript, particularly the deobfuscated versions, likely functions as a downloader for further malicious content. The presence of multiple JavaScript streams and the specific heuristic signals strongly suggest a dropper mechanism designed to evade static analysis.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7236235-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7236235-0
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` `a3319192cac6d4dc4eeb6af2d736b0ffec979b23116a003bc7c23382761c32a5`	pdf-javascript-stream	PDF /JS object 5 at offset 0x148	733 bytes
`legacy_pdfkit_stage_000.js` `2034c3c0776d5da7e7b43c186473ce387e013085c9e6a57440fd715a457e4c42`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1AF8	12520 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` `77112ff4aa029de2296dca9d4df7f99796362b5d1c9b269315a88ef6a2b38ff5`	deobfuscated-js	PDF JavaScript deobfuscation pass	105923 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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